GridView即使在數據綁定後也不會顯示

我在我的頁面上有一個GridView，我想將數據綁定到數據，並在顯示GridView之前進行一些排序，但沒有顯示任何內容。以下是我的代碼：GridView即使在數據綁定後也不會顯示

Dim dt As New DataTable 
    Dim dr As DataRow 

    ' define the table's schema 

    dt.Columns.Add(New DataColumn("PP", GetType(String))) 
    dt.Columns.Add(New DataColumn("-", GetType(String))) 
    dt.Columns.Add(New DataColumn("Distance", GetType(String))) 


    Dim i As Integer = 0 


    ' Now Create a loop that Add data into datagridview and sort by shortest distance 

    For Each r As System.Guid In arrid 
     dr = dt.NewRow() 
     dr("PP") = ResolveUrl(arrpic(i)) 
     dr("-") = Arrnames(i).ToString & " (" & arrage(i) & ")" & vbCrLf & arrgender(i) & " from " & arrlocation(i) & vbCrLf & arrcomments(i) 
     dr("Distance") = arrdistance(i) 

     i = +1 
    Next 

    GridView1.DataSource = dt.DataSet 
    GridView1.DataBind() 
    'SortDirection data by shortest distance 
    'GridView1.Sort("Distance", SortDirection.Ascending)

來源

2014-09-06 kilojoules88

簡單的事情是設置斷點並檢查數據表或數據集是否爲空... – 2014-09-06 19:21:12

'GridView1.DataSource = dt' – OneFineDay 2014-09-06 19:25:19

@Ganesh_Devlekar。我試圖用這一行來計算表格：MsgBox（dt.DataSet.Tables.Count），但我沒有將對象引用設置爲對象消息的實例，表明沒有表格存在。我不知道爲什麼？ – kilojoules88 2014-09-06 19:44:18

GridView未顯示，因爲它是空的。

你還沒有加入新行到DataTable，因此要麼使用table.Rows.Add(newRow)或table.Rows.Add()代替它返回已添加（空）行：

For Each r As System.Guid In arrid 
    Dim dr = dt.NewRow() ' empty row not added yet 
    dr("PP") = ResolveUrl(arrpic(i)) 
    dr("-") = Arrnames(i).ToString & " (" & arrage(i) & ")" & vbCrLf & arrgender(i) & " from " & arrlocation(i) & vbCrLf & arrcomments(i) 
    dr("Distance") = arrdistance(i) 
    dt.Rows.Add(dr) ' now added 
    i = +1 
Next

或

For Each r As System.Guid In arrid 
    Dim dr = dt.Rows.Add() ' empty row now already added 
    dr("PP") = ResolveUrl(arrpic(i)) 
    dr("-") = Arrnames(i).ToString & " (" & arrage(i) & ")" & vbCrLf & arrgender(i) & " from " & arrlocation(i) & vbCrLf & arrcomments(i) 
    dr("Distance") = arrdistance(i) 
    i = +1 
Next

我喜歡第二種方法，如果可能的話，它保存一行，並防止這樣的問題。

來源

2014-09-06 19:26:44

謝謝蒂姆，它的工作 – kilojoules88 2014-09-06 19:56:36

GridView即使在數據綁定後也不會顯示

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