Question

我的页面上有一个GridView，我想将数据绑定到，并在显示GridView之前进行一些排序但没有显示任何内容。以下是我的代码：

  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)

Answer 1

GridView未显示，因为它是空的。

您尚未将新行添加到DataTable，因此请使用table.Rows.Add(newRow)或table.Rows.Add()而不是返回已添加的（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

如果可能的话，我更喜欢第二种方式，它会保存一行并防止出现这样的问题。

即使在数据绑定后，也不会显示GridView

1 个答案: