Question

在DetailsView中，我为HeaderText为“No Treatment Reason：”的TemplateField设置了visible = false。在后面的代码中，我如何显式引用DataRow并根据其他TemplateField的值使用HeaderText“Care Plan Intent：”使其可见？

<asp:DetailsView ID="dvTest" FooterStyle-Width="100%" Font-Bold="false" BackColor="#A2C4EA" 
    FieldHeaderStyle-Width="35%" BorderWidth="1" CellSpacing="2" Font-Names="Arial, Helvetica, sans-serif" 
    Font-Size="12px" runat="server" AutoGenerateRows="False" AllowPaging="False" style="width:98%"
    HeaderStyle-BackColor="White" HeaderStyle-Font-Bold="true" HeaderStyle-HorizontalAlign="center">
<Fields>
<asp:TemplateField HeaderText="Care Plan Intent:">
        <ItemTemplate>
            <asp:Label skinid="tablabelblack" id="lblIntent" runat="server" Text='<%# Eval("CarePlanIntent") %>' />
            <asp:HiddenField runat="server" ID="hidCarePlanIntent" Value='<%# Eval("CarePlanIntent") %>' />
        </ItemTemplate>
    </asp:TemplateField>
<asp:TemplateField HeaderText="No Treatment Reason:" Visible="false">
        <ItemTemplate>
            <asp:Label skinid="tablabelblack" id="lblNoTreatmentReason" runat="server" Text='<%# Eval("NoTreatmentReason") %>' />
        </ItemTemplate>
    </asp:TemplateField>
</Fields>
</asp:DetailsView>

Answer 1

您必须使用DataBound事件并将DataItem转换为正确的类型（f.e. DataRowView）。您可以使用FindControl来获取控件并按照LINQ查询获取正确的列以使其显示（in）：

protected void dvTest_DataBound(Object sender, EventArgs e)
{
    var noTreatCol = this.dvTest.Fields.Cast<DataControlField>()
        .First(field => field.HeaderText == "No Treatment Reason:");
    DataRow row = ((DataRowView) dvTest.DataItem).Row;
    Label tablabelblack = (Label)dvTest.FindControl("tablabelblack");
    HiddenField hidCarePlanIntent = (HiddenField)dvTest.FindControl("hidCarePlanIntent");
    string value = row.Field<string>("Value"); // just an example
    noTreatCol.Visible = value == "SomeValueThatMakesItVisible";
}

是否有可能在VB中没有LINQ？

当然：

Protected Sub dvTest_DataBound(sender As Object, e As EventArgs)
    Dim row As DataRow = DirectCast(dvTest.DataItem, DataRowView).Row
    Dim tablabelblack As Label = DirectCast(dvTest.FindControl("tablabelblack"), Label)
    Dim hidCarePlanIntent As HiddenField = DirectCast(dvTest.FindControl("hidCarePlanIntent"), HiddenField)

    Dim value As String = row.Field(Of String)("Value") ' just an example '
    Dim noTreatColIndex As Int32 = -1
    For i As Int32 = 0 To Me.dvTest.Fields.Count - 1
        Dim field = dvTest.Fields(i)
        If field.HeaderText = "No Treatment Reason:" Then
            noTreatColIndex = i
            Exit For
        End If
    Next
    If noTreatColIndex > -1 Then
        dvTest.Fields(noTreatColIndex).Visible = value = "SomeValueThatMakesItVisible"
    End If
End Sub

如何在后面的代码中显式引用DataRow，并根据另一个DataRow值显示/隐藏

1 个答案: