F＃Silverlight：使用PropertyPath或其他方法來按順序綁定列

Question

我試圖動態地填充自動填充的值。我得到一個SearchResult元組列表，其中每個元組的第一個字符串是KEY，字符串列表是每列需要顯示的顯示文本。假設是任何SearchResult列表中的所有行都將包含顯示文本列表中相同數量的項目。我真的希望能夠綁定到按順序顯示文本列表的值...

一個簡單的例子將採取的數據是這樣的：

[ 
    ("MSFT.OQ", ["MSFT.OQ"; "Microsoft"; "Nasdaq"]) ; 
    ("GOOG.OQ", ["GOOG.OQ"; "Google"; "Nasdaq"]); 
] 

，並顯示：

MSFT.OQ   Microsoft  Nasdaq 
GOOG.OQ   Google   Nasdaq 

但我看到的是這樣的：

["MSFT.OQ"; "Microsoft"; "Nasdaq"]  ["MSFT.OQ"; "Microsoft"; "Nasdaq"] ["MSFT.OQ"; "Microsoft"; "Nasdaq"] 
["GOOG.OQ"; "Google"; "Nasdaq"]  ["GOOG.OQ"; "Google"; "Nasdaq"]  ["GOOG.OQ"; "Google"; "Nasdaq"] 

完整列表將在每列結束了，所以我認爲我的裝訂已關閉。

我的示例代碼（試圖從一個更復雜的模型簡化）：令人驚訝

type SearchResult = (string * string list) 

type Template() as this = 
    inherit Page 

    [<DefaultValue>] 
    val mutable acbTickerSearch : AutoCompleteBox 

    do 
     this.acbTickerSearch = this ? acbTickerSearch 
     this.display Some(this.getSampleResults()) 

    member private this.getSampleResults() = 
     [ 
      ("MSFT.OQ", ["MSFT.OQ"; "Microsoft"; "Nasdaq"]) ; 
      ("GOOG.OQ", ["GOOG.OQ"; "Google"; "Nasdaq"]); 
      ("IBM", ["IBM"; "International Business Machines"; "NYSE"]); 
      ("AKAM.OQ", ["AKAM.OQ"; "Akamai"; "Nasdaq"]); 
     ] 

    member this.display (results: SearchResult list option) = 
     let build(result: SearchResult) = 
      // if we haven't built the bindings yet lets do so 
      if this.tickerSearchDataGrid = null then 
       // create a grid 
       this.tickerSearchDataGrid <- new DataGrid() 
       this.tickerSearchDataGrid.AutoGenerateColumns <- false 

       let addColumn i (item: string) = 
        let col = new DataGridTextColumn() 
        let binding = System.Windows.Data.Binding() 

        // LOOK HERE: attempting to bind to an indexer... not working so well,, 
        binding.Path <- PropertyPath([i]) 

        col.Binding <- binding 
        this.tickerSearchDataGrid.Columns.Add(col) 
        i + 1 

       result 
        // the second portion of the tuple, is a list that 
        // needs to be displayed, wach item in its own column 
        |> snd 
        // should probably be List.iteri 
        |> List.fold addColumn 0 
        // don't need this with List.iteri 
        |> ignore 

     let displayResults (resultLst: SearchResult list) = 
      // create a list of lists, throwing away the "key" portion of the tuple 
      // potentially a bug I need toget around... 
      let lst = 
       resultLst 
        |> List.map (fun (r: SearchResult) -> snd r) 

      // bind to the data source 
      this.tickerSearchDataGrid.ItemsSource <- lst 
      this.tickerSearchDataGrid.HeadersVisibility <- DataGridHeadersVisibility.None 
      this.acbTickerSearch.ItemsSource <- [this.tickerSearchDataGrid] 
      this.acbTickerSearch.IsDropDownOpen <- true 

     match results with 
     | None ->() 
     | Some r -> 
      // set the number of columns based on the results, 
      // assume all tuples will have an equal number of values, 
      // we only need the head to determine the columns then 
      build <| List.head r 

      // bind the results 
      displayResults r 

謝謝...

---

（至少對我來說），這些返回相同的結果：

binding.Path <- PropertyPath([]) 
    binding.Path <- PropertyPath("") 
    binding.Path <- PropertyPath([0].[0]) 

賺不了多少意義的，我...

Answer 1

採用這樣的： http://www.scottlogic.co.uk/blog/colin/2009/04/binding-a-silverlight-datagrid-to-dynamic-data-via-idictionary/

工作：

type RowIndexConverter() = 
    interface IValueConverter with 
     member this.Convert(value, targetType, parameter, culture) = 
      let row = value :?> string list ; 

      let index: int = parameter :?> int; 
      row.[index] :> obj; 

     member this.ConvertBack(value, targetType, parameter, culture) = raise <| NotImplementedException() 

，並在我的代碼替換與

結合

let binding = System.Windows.Data.Binding() 
binding.Path <- PropertyPath([]) 
binding.Converter <- RowIndexConverter() 
binding.ConverterParameter <- i 

我顧這是一個好的解決方案。希望大腦（這是一個錯字或神聖的干預）也可以發揮作用，它更直截了當。

Answer 2

我真的不知道，但我會嘗試

binding.Path <- PropertyPath(sprintf "[%d]" i) 

（例如把它帶引號的字符串內），基於閱讀本：

http://msdn.microsoft.com/en-us/library/cc645024%28VS.95%29.aspx