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[英]LINQ to Entities does not recognize the method 'System.Collections.Generic.Dictionary`2[System.Int32,System.String] ToDictionary
[英]LINQ to Entities does not recognize the method 'System.Collections.Generic.Dictionary`
我有這個錯誤的時間錯誤異常
LINQ to Entities does not recognize the method
'System.Collections.Generic.Dictionary`2[System.String,System.Collections.Generic.List`1[Project.Model.Value]]
ToDictionary[Value,String,List`1](System.Collections.Generic.IEnumerable`1[Project.Model.Value],
System.Func`2[Project.Model.Value,System.String],
System.Func`2[Project.Model.Value,System.Collections.Generic.List`1[Project.Model.Value]])'
method, and this method cannot be translated into a store expression.
我盡力修復它但沒用。 我認為來自列表的異常可以幫助我解決它
public IEnumerable<ItemManagement> getItemsForFormType(string formType)
{
using (var db = new AthenaContext())
{
List<Value> dropDownListValue = (from val in db.Values
where val.ParentId == (from va in db.Values
where
va.ParentId
== (from value3 in db.Values
where value3.Name == formType
select value3.RecordId).FirstOrDefault()
select va.RecordId).FirstOrDefault()
select val).ToList();
var result = (from value1 in db.Values
where value1.Name == formType
select
new ItemManagement
{
FormType = value1.Name,
RecordID = value1.RecordId,
FormControllerNames =
(from va in db.Values
where va.ParentId == (from value3 in db.Values where value3.Name == formType select value3.RecordId).FirstOrDefault()
select va).ToDictionary(va => va.Name, va => dropDownListValue)
}).ToList();
return result;
}
您正在嘗試將.NET庫函數嵌入到EF查詢中。 因為它不能翻譯成SQL,所以不支持。
您必須重寫查詢,而不使用.ToDictionary()。
這種特殊情況可能並不難。 如果根本需要投影ToDictionary(),請重新訪問。 您可以使用以下方法安全地編寫SQL可翻譯投影:
.Select( new { anyName: <expression>, otherName: <otherExpression>, etc })
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