實體框架遞增的索引屬性組

Question

我想有一個遞增的獨立組各項目（如描述here一個int屬性，因爲報價所需的可訪問樣/person/quote/1..2..3不/person/quote/1..5..10：

Quote Person Index 
Lorem Smith 1 
Ipsum Smith 2 
Loremi Lewis 1 
Ipsumi Lewis 2 

在這個問題使用代碼EF：

var query = _data.Quotes 
    .GroupBy(x => x.Person.Name) 
    .Select 
    (
     x => x.Select((y, i) => new { y.Text, y.Person.Name, Index = i + 1 }) 
    ) 
    .SelectMany(x => x); 

但EF不能分析它，並返回NotSupportedException例外：

LINQ to Entities does not recognize the method 
System.Collections.Generic.IEnumerable`1[<>f__AnonymousType9`2[System.String,System.Int32]] Select[Quote,<>f__AnonymousType9`2](System.Collections.Generic.IEnumerable`1[App.Models.Quote], System.Func`3[App.Models.Quote,System.Int32,<>f__AnonymousType9`2[System.String,System.Int32]]) and this method cannot be translated into a store expression 

Answer 1

由於Dabblernl的評論此代碼工作：

var query = _data.Quotes 
    .GroupBy(x => x.Person.Name) 
    .ToList() 
    .Select 
    (
     x => x.Select((y, i) => new { y.Person.Name, y.Text, Index = i + 1 }) 
    ) 
    .SelectMany(x => x); 

Answer 2

查詢：

var query = _data.Quotes 
    .GroupBy(x => x.Person.Name.ToLower()) 
    .Select 
    (
    x => x.Select((y, i) => new { y.Text.ToLower(), y.Person.Name.ToLower(), Index = i + 1 }) 
) 
    .SelectMany(x => x);