Erhalte Rückgabewert von gespeicherter Prozedur

Question

Ich benutze Entity Framework 5 mit dem Code First Ansatz. Ich muss den Rückgabewert von einer gespeicherten Prozedur lesen; Ich lese bereits Ausgabeparameter und sende Eingabeparameter, aber ich weiß nicht, wie ich den Rückgabewert lesen soll.

Ist es möglich?

Hier ist der Code, den ich die gespeicherte Prozedur aufzurufen verwenden:

var outParam = new SqlParameter(); 
outParam.ParameterName = "@StatusLog"; 
outParam.SqlDbType = SqlDbType.NVarChar; 
outParam.Size = 4000; 
outParam.Direction = ParameterDirection.Output; 

var code = new SqlParameter(); 
code.ParameterName = "@Code"; 
code.Direction = ParameterDirection.Input; 
code.SqlDbType = SqlDbType.VarChar; 
code.Size = 20; 
code.Value = "123"; 

var data = _context.Database.SqlQuery<Item>("exec spItemData @Code, @StatusLog OUT", code, outParam); 

var result = data.FirstOrDefault(); 

Answer 1

Ich fand es! Ich kann den Rückgabewert mit einem Ausgabeparameter lesen, die auf diese Weise verwendet werden muss:

// define a new output parameter 
var returnCode = new SqlParameter(); 
returnCode.ParameterName = "@ReturnCode"; 
returnCode.SqlDbType = SqlDbType.Int; 
returnCode.Direction = ParameterDirection.Output; 

// assign the return code to the new output parameter and pass it to the sp 
var data = _context.Database.SqlQuery<Item>("exec @ReturnCode = spItemData @Code, @StatusLog OUT", returnCode, code, outParam); 

Answer 2

Sie können die gespeicherte Prozedur als EF-Funktion fügen Sie es dann driectly aus dem Kontext nennen.

Siehe http://www.entityframeworktutorial.net/EntityFramework4.3/execute-stored-procedure-using-dbcontext.aspx

für weitere Informationen

Answer 3

Die Lösung von Daniele zur Verfügung gestellt wurde für mich nicht funktioniert, bis ich dieses blog post von Diego Vega gefunden, was erklärt, dass:

Sie müssen um die gesamten Ergebnisse zu lesen, bevor Sie auf die Werte der Ausgabeparameter zugreifen können (...). So funktionieren gespeicherte Prozeduren und nicht spezifisch für diese EF-Funktion.

Auch in meinem Fall war ich ein Unternehmen nicht zurückkehrte, hatte ich nur die gespeicherte Prozedur auszuführen, so dass ich ersetzt Item mit object in _context.Database.SqlQuery<object>. Hier

ist der Beispielcode:

var code = new SqlParameter("@Code", 1); 

var returnCode = new SqlParameter("@ReturnCode", SqlDbType.Int); 
returnCode.Direction = ParameterDirection.Output; 

var outParam = new SqlParameter("@StatusLog", SqlDbType.Int); 
outParam.Direction = ParameterDirection.Output; 

var sql = "exec @ReturnCode = spSomeRoutine @Code, @StatusLog OUT"; 
var data = _context.Database.SqlQuery<object>(sql, returnCode, code, outParam); 

// Read the results so that the output variables are accessible 
var item = data.FirstOrDefault(); 

var returnCodeValue = (int)returnCode.Value; 
var outParamValue = (int)outParam.Value; 

Hier ist ein Beispiel gespeicherte Prozedur:

CREATE PROCEDURE [dbo].[spSomeRoutine] 
    @Code Int, 
    @StatusLog INT OUTPUT 
AS 
BEGIN 
    SET @StatusLog = 5 
    RETURN 10 
END 

Answer 4

In dem Fall, dass die gespeicherte Prozedur nicht einen Ausgabeparameter hat ich folgendes tun, was effektiv einige Sql, die eine select-Anweisung zurückgeben;

var data = context.Database.SqlQuery<int>(@"declare @num int 
exec @num = myStoredProcThatReturnsInt 
select @num"); 

var result = data.First(); 

Answer 5

Für jedermann mit einem EDMX Arbeits Datei, die Sie ein Code-Generierung Element hinzufügen und dann den folgenden T4-Code verwenden, um die .Context.tt zu ersetzen. Es wird den gesamten Code erstellen Sie Ihre gespeicherten Prozeduren unter Verwendung des Verfahrens zur Karte:

var returnCode = new SqlParameter("@ReturnCode", SqlDbType.Int); 
returnCode.Direction = ParameterDirection.Output; 
var sql = "exec @ReturnCode = spSomeRoutine @Code, @StatusLog OUT"; 
var data = _context.Database.SqlQuery<object>(sql, returnCode, code, outParam); 

Es wird verwenden sqlquery <>, wenn ein Ergebnis dort eingestellt ist und ExecuteSqlCommand, wenn es nicht der Fall, aber in beiden Szenarien die aus SqlParameter localSqlExecReturnValue werden enthält den int-Rückkehrcode aus dem Aufruf der gespeicherten Prozedur. Dies kann mit anderen Generatoren verwendet werden, es generiert nur zusätzlichen Code für Aufrufe der gespeicherten Prozedur.

StoredProcedure.Context.tt:

<#@ template language="C#" debug="false" hostspecific="true"#> 
<#@ include file="EF6.Utility.CS.ttinclude"#><#@ 
output extension=".cs"#><# 

const string inputFile = @"CDMSAccountingModel.edmx"; 
var textTransform = DynamicTextTransformation.Create(this); 
var code = new CodeGenerationTools(this); 
var ef = new MetadataTools(this); 
var typeMapper = new TypeMapper(code, ef, textTransform.Errors); 
var loader = new EdmMetadataLoader(textTransform.Host, textTransform.Errors); 
var itemCollection = loader.CreateEdmItemCollection(inputFile); 
var modelNamespace = loader.GetModelNamespace(inputFile); 
var codeStringGenerator = new CodeStringGenerator(code, typeMapper, ef); 

var container = itemCollection.OfType<EntityContainer>().FirstOrDefault(); 
if (container == null) 
{ 
    return string.Empty; 
} 
#> 
//------------------------------------------------------------------------------ 
// <auto-generated> 
// <#=CodeGenerationTools.GetResourceString("Template_GeneratedCodeCommentLine1")#> 
// 
// <#=CodeGenerationTools.GetResourceString("Template_GeneratedCodeCommentLine2")#> 
// <#=CodeGenerationTools.GetResourceString("Template_GeneratedCodeCommentLine3")#> 
// </auto-generated> 
//------------------------------------------------------------------------------ 

<# 

var codeNamespace = code.VsNamespaceSuggestion(); 
if (!String.IsNullOrEmpty(codeNamespace)) 
{ 
#> 
namespace <#=code.EscapeNamespace(codeNamespace)#> 
{ 
<# 
    PushIndent(" "); 
} 

#> 
using System; 
using System.Data.Entity; 
using System.Data.Entity.Infrastructure; 
<# 
if (container.FunctionImports.Any()) 
{ 
#> 
using System.Data.Entity.Core.Objects; 
using System.Linq; 
<# 
} 
#> 

<#=Accessibility.ForType(container)#> partial class <#=code.Escape(container)#> : DbContext 
{ 

<# 
foreach (var entitySet in container.BaseEntitySets.OfType<EntitySet>()) 
{ 
    // Note: the DbSet members are defined below such that the getter and 
    // setter always have the same accessibility as the DbSet definition 
    if (Accessibility.ForReadOnlyProperty(entitySet) != "public") 
    { 
#> 
     <#=codeStringGenerator.DbSetInitializer(entitySet)#> 
<# 
    } 
} 
#> 



<# 
    foreach (var edmFunction in container.FunctionImports) 
    { 
     WriteFunctionImport(typeMapper, codeStringGenerator, edmFunction, modelNamespace, includeMergeOption: false); 
    } 
#> 
} 
<# 

if (!String.IsNullOrEmpty(codeNamespace)) 
{ 
    PopIndent(); 
#> 
} 
<# 
} 
#> 
<#+ 

private void WriteFunctionImport(TypeMapper typeMapper, CodeStringGenerator codeStringGenerator, EdmFunction edmFunction, string modelNamespace, bool includeMergeOption) 
{ 
    if (typeMapper.IsComposable(edmFunction)) 
    { 
#> 

    [DbFunction("<#=edmFunction.NamespaceName#>", "<#=edmFunction.Name#>")] 
    <#=codeStringGenerator.ComposableFunctionMethod(edmFunction, modelNamespace)#> 
    { 
<#+ 
     codeStringGenerator.WriteFunctionParameters(edmFunction, WriteFunctionParameter); 
#> 
     <#=codeStringGenerator.ComposableCreateQuery(edmFunction, modelNamespace)#> 
    } 
<#+ 
    } 
    else 
    { 
#> 

    <#=codeStringGenerator.FunctionMethod(edmFunction, modelNamespace, includeMergeOption)#> 
    { 
<#+ 
     codeStringGenerator.WriteFunctionParameters(edmFunction, WriteFunctionParameter); 
#> 
     localSqlExecReturnValue = new System.Data.SqlClient.SqlParameter("@localExecReturnValue",System.Data.SqlDbType.Int); 
     localSqlExecReturnValue.Direction = System.Data.ParameterDirection.Output; 

     <#=codeStringGenerator.ExecuteFunction(edmFunction, modelNamespace, includeMergeOption)#> 
    } 
<#+ 
     if (typeMapper.GenerateMergeOptionFunction(edmFunction, includeMergeOption)) 
     { 
      WriteFunctionImport(typeMapper, codeStringGenerator, edmFunction, modelNamespace, includeMergeOption: true); 
     } 
    } 
} 

public void WriteFunctionParameter(string name, string isNotNull, string notNullInit, string nullInit) 
{ 
#> 
     var <#=name#> = <#=isNotNull#> ? 
      <#=notNullInit#> : 
      <#=nullInit#>; 

<#+ 
} 

public const string TemplateId = "CSharp_DbContext_Context_EF6"; 

public class CodeStringGenerator 
{ 
    private readonly CodeGenerationTools _code; 
    private readonly TypeMapper _typeMapper; 
    private readonly MetadataTools _ef; 

    public CodeStringGenerator(CodeGenerationTools code, TypeMapper typeMapper, MetadataTools ef) 
    { 
     ArgumentNotNull(code, "code"); 
     ArgumentNotNull(typeMapper, "typeMapper"); 
     ArgumentNotNull(ef, "ef"); 

     _code = code; 
     _typeMapper = typeMapper; 
     _ef = ef; 
    } 

    public string Property(EdmProperty edmProperty) 
    { 
     return string.Format(
      CultureInfo.InvariantCulture, 
      "{0} {1} {2} {{ {3}get; {4}set; }}", 
      Accessibility.ForProperty(edmProperty), 
      _typeMapper.GetTypeName(edmProperty.TypeUsage), 
      _code.Escape(edmProperty), 
      _code.SpaceAfter(Accessibility.ForGetter(edmProperty)), 
      _code.SpaceAfter(Accessibility.ForSetter(edmProperty))); 
    } 

    public string NavigationProperty(NavigationProperty navProp) 
    { 
     var endType = _typeMapper.GetTypeName(navProp.ToEndMember.GetEntityType()); 
     return string.Format(
      CultureInfo.InvariantCulture, 
      "{0} {1} {2} {{ {3}get; {4}set; }}", 
      AccessibilityAndVirtual(Accessibility.ForNavigationProperty(navProp)), 
      navProp.ToEndMember.RelationshipMultiplicity == RelationshipMultiplicity.Many ? ("ICollection<" + endType + ">") : endType, 
      _code.Escape(navProp), 
      _code.SpaceAfter(Accessibility.ForGetter(navProp)), 
      _code.SpaceAfter(Accessibility.ForSetter(navProp))); 
    } 

    public string AccessibilityAndVirtual(string accessibility) 
    { 
     return accessibility + (accessibility != "private" ? " virtual" : ""); 
    } 

    public string EntityClassOpening(EntityType entity) 
    { 
     return string.Format(
      CultureInfo.InvariantCulture, 
      "{0} {1}partial class {2}{3}", 
      Accessibility.ForType(entity), 
      _code.SpaceAfter(_code.AbstractOption(entity)), 
      _code.Escape(entity), 
      _code.StringBefore(" : ", _typeMapper.GetTypeName(entity.BaseType))); 
    } 

    public string EnumOpening(SimpleType enumType) 
    { 
     return string.Format(
      CultureInfo.InvariantCulture, 
      "{0} enum {1} : {2}", 
      Accessibility.ForType(enumType), 
      _code.Escape(enumType), 
      _code.Escape(_typeMapper.UnderlyingClrType(enumType))); 
     } 

    public void WriteFunctionParameters(EdmFunction edmFunction, Action<string, string, string, string> writeParameter) 
    { 
     var parameters = FunctionImportParameter.Create(edmFunction.Parameters, _code, _ef); 
     foreach (var parameter in parameters.Where(p => p.NeedsLocalVariable)) 
     { 
      var isNotNull = parameter.IsNullableOfT ? parameter.FunctionParameterName + ".HasValue" : parameter.FunctionParameterName + " != null"; 
      var notNullInit = "new System.Data.SqlClient.SqlParameter(\"@" + parameter.EsqlParameterName + "\", " + parameter.FunctionParameterName + ")"; 
      var nullInit = "new System.Data.SqlClient.SqlParameter(\"@" + parameter.EsqlParameterName + "\", SqlHelper.GetDbType(typeof(" + TypeMapper.FixNamespaces(parameter.RawClrTypeName) + ")))"; 
      writeParameter(parameter.LocalVariableName, isNotNull, notNullInit, nullInit); 
     } 
    } 

    public string ComposableFunctionMethod(EdmFunction edmFunction, string modelNamespace) 
    { 
     var parameters = _typeMapper.GetParameters(edmFunction); 

     return string.Format(
      CultureInfo.InvariantCulture, 
      "{0} IQueryable<{1}> {2}({3})", 
      AccessibilityAndVirtual(Accessibility.ForMethod(edmFunction)), 
      _typeMapper.GetTypeName(_typeMapper.GetReturnType(edmFunction), modelNamespace), 
      _code.Escape(edmFunction), 
      string.Join(", ", parameters.Select(p => TypeMapper.FixNamespaces(p.FunctionParameterType) + " " + p.FunctionParameterName).ToArray())); 
    } 

    public string ComposableCreateQuery(EdmFunction edmFunction, string modelNamespace) 
    { 
     var parameters = _typeMapper.GetParameters(edmFunction); 

     return string.Format(
      CultureInfo.InvariantCulture, 
      "return ((IObjectContextAdapter)this).ObjectContext.CreateQuery<{0}>(\"[{1}].[{2}]({3})\"{4});", 
      _typeMapper.GetTypeName(_typeMapper.GetReturnType(edmFunction), modelNamespace), 
      edmFunction.NamespaceName, 
      edmFunction.Name, 
      string.Join(", ", parameters.Select(p => "@" + p.EsqlParameterName).ToArray()), 
      _code.StringBefore(", ", string.Join(", ", parameters.Select(p => p.ExecuteParameterName).ToArray()))); 
    } 

    public string FunctionMethod(EdmFunction edmFunction, string modelNamespace, bool includeMergeOption) 
    { 
     var parameters = _typeMapper.GetParameters(edmFunction); 
     var returnType = _typeMapper.GetReturnType(edmFunction); 

     var paramList = String.Join(", ", parameters.Select(p => TypeMapper.FixNamespaces(p.FunctionParameterType) + " " + p.FunctionParameterName).ToArray()); 
     paramList = String.Join(",", paramList, " out System.Data.SqlClient.SqlParameter localSqlExecReturnValue").Trim().TrimStart(','); 
     paramList = paramList.Replace("ObjectParameter", "System.Data.SqlClient.SqlParameter"); 
     if (includeMergeOption) 
     { 
      paramList = _code.StringAfter(paramList, ", ") + "MergeOption mergeOption"; 
     } 

     return string.Format(
      CultureInfo.InvariantCulture, 
      "{0} {1} {2}({3})", 
      AccessibilityAndVirtual(Accessibility.ForMethod(edmFunction)), 
      returnType == null ? "int" : "System.Collections.Generic.List<" + _typeMapper.GetTypeName(returnType, modelNamespace) + ">", 
      _code.Escape(edmFunction), 
      paramList); 
    } 

    public string ExecuteFunction(EdmFunction edmFunction, string modelNamespace, bool includeMergeOption) 
    { 
     var parameters = _typeMapper.GetParameters(edmFunction); 
     var returnType = _typeMapper.GetReturnType(edmFunction); 

     var callParams = String.Join(", ", parameters.Select(p => p.ExecuteParameterName).ToArray()); 
     callParams = _code.StringBefore(", ", String.Join(",", "localSqlExecReturnValue", callParams)).TrimEnd(',').Trim(); 

     var inSqlParams = String.Join(", ", parameters.Where(p => p.NeedsLocalVariable).Select(p => "@" + p.Source.Name).ToArray()); 
     var outSqlParams = String.Join(", ", parameters.Where(p => !p.NeedsLocalVariable).Select(p => "@" + p.Source.Name + " OUTPUT").ToArray()); 
     var sqlParams = ""; 
     if (inSqlParams.Count() > 0) 
     { 
      sqlParams = String.Join(", ", sqlParams, inSqlParams); 
     } 
     if (outSqlParams.Count() > 0) 
     { 
      sqlParams = String.Join(", ", sqlParams, outSqlParams); 
     } 
     sqlParams = sqlParams.Trim().Trim(',').Trim(); 
     if (includeMergeOption) 
     { 
      callParams = ", mergeOption" + callParams; 
     } 
     var retstring = string.Format(
      CultureInfo.InvariantCulture, 
      "var results = {3}{0}(\"EXEC @localExecReturnValue = {1} {4}\"{2});", 
      returnType == null ? "" : "<" + _typeMapper.GetTypeName(returnType, modelNamespace) + ">", 
      edmFunction.Name, 
      callParams,returnType != null ? "this.Database.SqlQuery" : "this.Database.ExecuteSqlCommand", sqlParams); 
     retstring += Environment.NewLine; 
     retstring += returnType != null ? "\t\treturn results.ToList();" : "\t\treturn results;"; 
     //retstring += Environment.NewLine + "\t\tlocalExecReturnValue = (int)localSqlExecReturnValue.Value;" ; 
     //retstring += Environment.NewLine + "\t\treturn results;"; 
     return retstring; 
    } 

    public string DbSet(EntitySet entitySet) 
    { 
     return string.Format(
      CultureInfo.InvariantCulture, 
      "{0} virtual DbSet<{1}> {2} {{ get; set; }}", 
      Accessibility.ForReadOnlyProperty(entitySet), 
      _typeMapper.GetTypeName(entitySet.ElementType), 
      _code.Escape(entitySet)); 
    } 

    public string DbSetInitializer(EntitySet entitySet) 
    { 
     return string.Format(
      CultureInfo.InvariantCulture, 
      "{0} = Set<{1}>();", 
      _code.Escape(entitySet), 
      _typeMapper.GetTypeName(entitySet.ElementType)); 
    } 

    public string UsingDirectives(bool inHeader, bool includeCollections = true) 
    { 
     return inHeader == string.IsNullOrEmpty(_code.VsNamespaceSuggestion()) 
      ? string.Format(
       CultureInfo.InvariantCulture, 
       "{0}using System;{1}" + 
       "{2}", 
       inHeader ? Environment.NewLine : "", 
       includeCollections ? (Environment.NewLine + "using System.Collections.Generic;") : "", 
       inHeader ? "" : Environment.NewLine) 
      : ""; 
    } 
} 

public class TypeMapper 
{ 
    private const string ExternalTypeNameAttributeName = @"http://schemas.microsoft.com/ado/2006/04/codegeneration:ExternalTypeName"; 

    private readonly System.Collections.IList _errors; 
    private readonly CodeGenerationTools _code; 
    private readonly MetadataTools _ef; 

    public static string FixNamespaces(string typeName) 
    { 
     return typeName.Replace("System.Data.Spatial.", "System.Data.Entity.Spatial."); 
    } 

    public TypeMapper(CodeGenerationTools code, MetadataTools ef, System.Collections.IList errors) 
    { 
     ArgumentNotNull(code, "code"); 
     ArgumentNotNull(ef, "ef"); 
     ArgumentNotNull(errors, "errors"); 

     _code = code; 
     _ef = ef; 
     _errors = errors; 
    } 

    public string GetTypeName(TypeUsage typeUsage) 
    { 
     return typeUsage == null ? null : GetTypeName(typeUsage.EdmType, _ef.IsNullable(typeUsage), modelNamespace: null); 
    } 

    public string GetTypeName(EdmType edmType) 
    { 
     return GetTypeName(edmType, isNullable: null, modelNamespace: null); 
    } 

    public string GetTypeName(TypeUsage typeUsage, string modelNamespace) 
    { 
     return typeUsage == null ? null : GetTypeName(typeUsage.EdmType, _ef.IsNullable(typeUsage), modelNamespace); 
    } 

    public string GetTypeName(EdmType edmType, string modelNamespace) 
    { 
     return GetTypeName(edmType, isNullable: null, modelNamespace: modelNamespace); 
    } 

    public string GetTypeName(EdmType edmType, bool? isNullable, string modelNamespace) 
    { 
     if (edmType == null) 
     { 
      return null; 
     } 

     var collectionType = edmType as CollectionType; 
     if (collectionType != null) 
     { 
      return String.Format(CultureInfo.InvariantCulture, "ICollection<{0}>", GetTypeName(collectionType.TypeUsage, modelNamespace)); 
     } 

     var typeName = _code.Escape(edmType.MetadataProperties 
           .Where(p => p.Name == ExternalTypeNameAttributeName) 
           .Select(p => (string)p.Value) 
           .FirstOrDefault()) 
      ?? (modelNamespace != null && edmType.NamespaceName != modelNamespace ? 
       _code.CreateFullName(_code.EscapeNamespace(edmType.NamespaceName), _code.Escape(edmType)) : 
       _code.Escape(edmType)); 

     if (edmType is StructuralType) 
     { 
      return typeName; 
     } 

     if (edmType is SimpleType) 
     { 
      var clrType = UnderlyingClrType(edmType); 
      if (!IsEnumType(edmType)) 
      { 
       typeName = _code.Escape(clrType); 
      } 

      typeName = FixNamespaces(typeName); 

      return clrType.IsValueType && isNullable == true ? 
       String.Format(CultureInfo.InvariantCulture, "Nullable<{0}>", typeName) : 
       typeName; 
     } 

     throw new ArgumentException("edmType"); 
    } 

    public Type UnderlyingClrType(EdmType edmType) 
    { 
     ArgumentNotNull(edmType, "edmType"); 

     var primitiveType = edmType as PrimitiveType; 
     if (primitiveType != null) 
     { 
      return primitiveType.ClrEquivalentType; 
     } 

     if (IsEnumType(edmType)) 
     { 
      return GetEnumUnderlyingType(edmType).ClrEquivalentType; 
     } 

     return typeof(object); 
    } 

    public object GetEnumMemberValue(MetadataItem enumMember) 
    { 
     ArgumentNotNull(enumMember, "enumMember"); 

     var valueProperty = enumMember.GetType().GetProperty("Value"); 
     return valueProperty == null ? null : valueProperty.GetValue(enumMember, null); 
    } 

    public string GetEnumMemberName(MetadataItem enumMember) 
    { 
     ArgumentNotNull(enumMember, "enumMember"); 

     var nameProperty = enumMember.GetType().GetProperty("Name"); 
     return nameProperty == null ? null : (string)nameProperty.GetValue(enumMember, null); 
    } 

    public System.Collections.IEnumerable GetEnumMembers(EdmType enumType) 
    { 
     ArgumentNotNull(enumType, "enumType"); 

     var membersProperty = enumType.GetType().GetProperty("Members"); 
     return membersProperty != null 
      ? (System.Collections.IEnumerable)membersProperty.GetValue(enumType, null) 
      : Enumerable.Empty<MetadataItem>(); 
    } 

    public bool EnumIsFlags(EdmType enumType) 
    { 
     ArgumentNotNull(enumType, "enumType"); 

     var isFlagsProperty = enumType.GetType().GetProperty("IsFlags"); 
     return isFlagsProperty != null && (bool)isFlagsProperty.GetValue(enumType, null); 
    } 

    public bool IsEnumType(GlobalItem edmType) 
    { 
     ArgumentNotNull(edmType, "edmType"); 

     return edmType.GetType().Name == "EnumType"; 
    } 

    public PrimitiveType GetEnumUnderlyingType(EdmType enumType) 
    { 
     ArgumentNotNull(enumType, "enumType"); 

     return (PrimitiveType)enumType.GetType().GetProperty("UnderlyingType").GetValue(enumType, null); 
    } 

    public string CreateLiteral(object value) 
    { 
     if (value == null || value.GetType() != typeof(TimeSpan)) 
     { 
      return _code.CreateLiteral(value); 
     } 

     return string.Format(CultureInfo.InvariantCulture, "new TimeSpan({0})", ((TimeSpan)value).Ticks); 
    } 

    public bool VerifyCaseInsensitiveTypeUniqueness(IEnumerable<string> types, string sourceFile) 
    { 
     ArgumentNotNull(types, "types"); 
     ArgumentNotNull(sourceFile, "sourceFile"); 

     var hash = new HashSet<string>(StringComparer.InvariantCultureIgnoreCase); 
     if (types.Any(item => !hash.Add(item))) 
     { 
      _errors.Add(
       new CompilerError(sourceFile, -1, -1, "6023", 
        String.Format(CultureInfo.CurrentCulture, CodeGenerationTools.GetResourceString("Template_CaseInsensitiveTypeConflict")))); 
      return false; 
     } 
     return true; 
    } 

    public IEnumerable<SimpleType> GetEnumItemsToGenerate(IEnumerable<GlobalItem> itemCollection) 
    { 
     return GetItemsToGenerate<SimpleType>(itemCollection) 
      .Where(e => IsEnumType(e)); 
    } 

    public IEnumerable<T> GetItemsToGenerate<T>(IEnumerable<GlobalItem> itemCollection) where T: EdmType 
    { 
     return itemCollection 
      .OfType<T>() 
      .Where(i => !i.MetadataProperties.Any(p => p.Name == ExternalTypeNameAttributeName)) 
      .OrderBy(i => i.Name); 
    } 

    public IEnumerable<string> GetAllGlobalItems(IEnumerable<GlobalItem> itemCollection) 
    { 
     return itemCollection 
      .Where(i => i is EntityType || i is ComplexType || i is EntityContainer || IsEnumType(i)) 
      .Select(g => GetGlobalItemName(g)); 
    } 

    public string GetGlobalItemName(GlobalItem item) 
    { 
     if (item is EdmType) 
     { 
      return ((EdmType)item).Name; 
     } 
     else 
     { 
      return ((EntityContainer)item).Name; 
     } 
    } 

    public IEnumerable<EdmProperty> GetSimpleProperties(EntityType type) 
    { 
     return type.Properties.Where(p => p.TypeUsage.EdmType is SimpleType && p.DeclaringType == type); 
    } 

    public IEnumerable<EdmProperty> GetSimpleProperties(ComplexType type) 
    { 
     return type.Properties.Where(p => p.TypeUsage.EdmType is SimpleType && p.DeclaringType == type); 
    } 

    public IEnumerable<EdmProperty> GetComplexProperties(EntityType type) 
    { 
     return type.Properties.Where(p => p.TypeUsage.EdmType is ComplexType && p.DeclaringType == type); 
    } 

    public IEnumerable<EdmProperty> GetComplexProperties(ComplexType type) 
    { 
     return type.Properties.Where(p => p.TypeUsage.EdmType is ComplexType && p.DeclaringType == type); 
    } 

    public IEnumerable<EdmProperty> GetPropertiesWithDefaultValues(EntityType type) 
    { 
     return type.Properties.Where(p => p.TypeUsage.EdmType is SimpleType && p.DeclaringType == type && p.DefaultValue != null); 
    } 

    public IEnumerable<EdmProperty> GetPropertiesWithDefaultValues(ComplexType type) 
    { 
     return type.Properties.Where(p => p.TypeUsage.EdmType is SimpleType && p.DeclaringType == type && p.DefaultValue != null); 
    } 

    public IEnumerable<NavigationProperty> GetNavigationProperties(EntityType type) 
    { 
     return type.NavigationProperties.Where(np => np.DeclaringType == type); 
    } 

    public IEnumerable<NavigationProperty> GetCollectionNavigationProperties(EntityType type) 
    { 
     return type.NavigationProperties.Where(np => np.DeclaringType == type && np.ToEndMember.RelationshipMultiplicity == RelationshipMultiplicity.Many); 
    } 

    public FunctionParameter GetReturnParameter(EdmFunction edmFunction) 
    { 
     ArgumentNotNull(edmFunction, "edmFunction"); 

     var returnParamsProperty = edmFunction.GetType().GetProperty("ReturnParameters"); 
     return returnParamsProperty == null 
      ? edmFunction.ReturnParameter 
      : ((IEnumerable<FunctionParameter>)returnParamsProperty.GetValue(edmFunction, null)).FirstOrDefault(); 
    } 

    public bool IsComposable(EdmFunction edmFunction) 
    { 
     ArgumentNotNull(edmFunction, "edmFunction"); 

     var isComposableProperty = edmFunction.GetType().GetProperty("IsComposableAttribute"); 
     return isComposableProperty != null && (bool)isComposableProperty.GetValue(edmFunction, null); 
    } 

    public IEnumerable<FunctionImportParameter> GetParameters(EdmFunction edmFunction) 
    { 
     return FunctionImportParameter.Create(edmFunction.Parameters, _code, _ef); 
    } 

    public TypeUsage GetReturnType(EdmFunction edmFunction) 
    { 
     var returnParam = GetReturnParameter(edmFunction); 
     return returnParam == null ? null : _ef.GetElementType(returnParam.TypeUsage); 
    } 

    public bool GenerateMergeOptionFunction(EdmFunction edmFunction, bool includeMergeOption) 
    { 
     var returnType = GetReturnType(edmFunction); 
     return !includeMergeOption && returnType != null && returnType.EdmType.BuiltInTypeKind == BuiltInTypeKind.EntityType; 
    } 
} 

public static void ArgumentNotNull<T>(T arg, string name) where T : class 
{ 
    if (arg == null) 
    { 
     throw new ArgumentNullException(name); 
    } 
} 
#>