Question

我收到以下错误。我试过谷歌搜索问题。但是我发现的帖子都没有帮助过我。

编辑：Per Henk的回复。有问题的表。

[Table("TransactionDetail")]
public partial class TransactionDetail
{
    [Key, Column(Order = 1), DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public long TransactionDetailId { get; set; }
    public string TransactionName { get; set; }
    public string TransactionValue { get; set; }

    public virtual OriginalTransaction OriginalTrans { get; set; }
}

其他部分。

public partial class TransactionDetail
{
    public Transaction trans;
}

更具体地说，当我使用LINQ“MyContext.SomeDB.Find（x）”时会发生错误。（如果这有帮助）。

我看过的一些帖子似乎符合我的问题，但不能帮助我解决它：

连接字符串:(在.config文件中）。

 <add name="TransactionEF" 
 connectionString="some connection string" 
 providerName="System.Data.EntityClient" />

EDMX Connectionstring 'name'

Value cannot be null. Parameter name: source

Getting Error The argument 'nameOrConnectionString' cannot be null, empty or contain only white space with Azure Database

这是我的dbContext类。

public partial class TransactionEF : DbContext
{
    public TransactionEF()
        : base("name=TransactionEF")
    {
    }   
    ...
}

System.ArgumentException: The argument 'name' cannot be null, empty or contain only white space.
at System.ComponentModel.DataAnnotations.Schema.TableAttribute..ctor(String name)
at System.Reflection.CustomAttribute._CreateCaObject(RuntimeModule pModule, IRuntimeMethodInfo pCtor, Byte** ppBlob, Byte* pEndBlob, Int32* pcNamedArgs)
at System.Reflection.CustomAttribute.CreateCaObject(RuntimeModule module, IRuntimeMethodInfo ctor, IntPtr& blob, IntPtr blobEnd, Int32& namedArgs)
at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeModule decoratedModule, Int32 decoratedMetadataToken, Int32 pcaCount, RuntimeType attributeFilterType, Boolean mustBeInheritable, IList derivedAttributes, Boolean isDecoratedTargetSecurityTransparent)
at System.Reflection.CustomAttribute.GetCustomAttributes(RuntimeType type, RuntimeType caType, Boolean inherit)
at System.ComponentModel.ReflectTypeDescriptionProvider.ReflectGetAttributes(Type type)
at System.ComponentModel.ReflectTypeDescriptionProvider.ReflectedTypeData.GetAttributes()
at System.ComponentModel.TypeDescriptor.TypeDescriptionNode.DefaultTypeDescriptor.System.ComponentModel.ICustomTypeDescriptor.GetAttributes()
at System.ComponentModel.TypeDescriptor.TypeDescriptionNode.DefaultTypeDescriptor.System.ComponentModel.ICustomTypeDescriptor.GetAttributes()
at System.ComponentModel.DataAnnotations.AssociatedMetadataTypeTypeDescriptor.GetAttributes()
at System.Data.Entity.ModelConfiguration.Utilities.AttributeProvider.GetAttributes(Type type)
at System.Data.Entity.ModelConfiguration.Conventions.TypeAttributeConfigurationConvention`1.<.ctor>b__1(Type t)
at System.Data.Entity.ModelConfiguration.Conventions.TypeConventionWithHavingBase`1.ApplyCore(Type memberInfo, ModelConfiguration modelConfiguration)
at System.Data.Entity.ModelConfiguration.Conventions.TypeConventionBase.Apply(Type memberInfo, ModelConfiguration modelConfiguration)
at System.Data.Entity.ModelConfiguration.Configuration.ConventionsConfiguration.ApplyModelConfiguration(Type type, ModelConfiguration modelConfiguration)
at System.Data.Entity.ModelConfiguration.Configuration.ConventionsConfiguration.ApplyModelConfiguration(Type type, ModelConfiguration modelConfiguration)
at System.Data.Entity.ModelConfiguration.Mappers.TypeMapper.MapEntityType(Type type)
at System.Data.Entity.ModelConfiguration.Mappers.NavigationPropertyMapper.Map(PropertyInfo propertyInfo, EntityType entityType, Func`1 entityTypeConfiguration)
at System.Data.Entity.ModelConfiguration.Mappers.TypeMapper.MapEntityType(Type type)
at System.Data.Entity.ModelConfiguration.Mappers.NavigationPropertyMapper.Map(PropertyInfo propertyInfo, EntityType entityType, Func`1 entityTypeConfiguration)
at System.Data.Entity.ModelConfiguration.Mappers.TypeMapper.MapEntityType(Type type)
at System.Data.Entity.ModelConfiguration.Mappers.NavigationPropertyMapper.Map(PropertyInfo propertyInfo, EntityType entityType, Func`1 entityTypeConfiguration)
at System.Data.Entity.ModelConfiguration.Mappers.TypeMapper.MapEntityType(Type type)
at System.Data.Entity.ModelConfiguration.Mappers.NavigationPropertyMapper.Map(PropertyInfo propertyInfo, EntityType entityType, Func`1 entityTypeConfiguration)
at System.Data.Entity.ModelConfiguration.Mappers.TypeMapper.MapEntityType(Type type)
at System.Data.Entity.DbModelBuilder.MapTypes(EdmModel model)
at System.Data.Entity.DbModelBuilder.Build(DbProviderManifest providerManifest, DbProviderInfo providerInfo)
at System.Data.Entity.DbModelBuilder.Build(DbConnection providerConnection)
at System.Data.Entity.Internal.LazyInternalContext.CreateModel(LazyInternalContext internalContext)
at System.Data.Entity.Internal.RetryLazy`2.GetValue(TInput input)
at System.Data.Entity.Internal.LazyInternalContext.InitializeContext()
at System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType)
at System.Data.Entity.Internal.Linq.InternalSet`1.Initialize()
at System.Data.Entity.Internal.Linq.InternalSet`1.get_InternalContext()
at System.Data.Entity.Internal.Linq.InternalSet`1.Find(Object[] keyValues)
at MyCompany... 
at MyCompany... 
at MyCompany...

Answer 1

 at System.ComponentModel.DataAnnotations.Schema.TableAttribute..ctor(String name)

您没有发布代码的相关部分。这不是关于这个构造函数。

查看TableAttribute Class

您应该在项目中查找任何[Table]或[Table("")]。

参数'name'不能为null，为空或仅包含空格

1 个答案: