使用空数据源显示Gridview的页眉/页脚？

2

读或者，您也可以通过使用EmptyDataTemplate property定义空的数据行自己的自定义用户界面。

2010-04-26 08:07:50

+0

其实我更喜欢'EmptyDataTemplate'比绑定更多的空'DataSet'到'GridView'，我一直是这样做，它有很多的问题和为什么他们居然把'EmptyDataTemplate'。我指责微软没有实现这样的功能，但是将空DataSet绑定到GridView并不是实现这一功能的最佳方式。 – 2012-05-07 19:16:19

1

可以通过分配一个虚拟行网格的数据源也做到这一点。默认情况下，数据源将填充虚拟行。所以网格也会显示页脚&。要隐藏行，您可以添加一个虚拟字段以显示是否显示控件。并将该字段绑定到控件的Visible属性。最后，当您将实际行添加到数据源时...删除您创建的虚拟行。

实例 - 来源：

<asp:GridView ID="grdQualify" runat="server" Width="100%" AutoGenerateColumns="False" ShowFooter="true" 
         EnableModelValidation="True"> 
         <Columns> 
          <asp:TemplateField HeaderText="Qualifying Exam"> 
           <ItemTemplate> 
            <asp:TextBox ID="txtQualifyingExam" runat="server" Text='<%# Eval("QualifyingExam") %>' Visible='<%# Eval("ShowVisible") %>'></asp:TextBox> 
           </ItemTemplate> 
           <FooterTemplate> 
            <asp:TextBox ID="txtQualifyingExamF" runat="server"></asp:TextBox> 
           </FooterTemplate> 
          </asp:TemplateField> 
          <asp:TemplateField HeaderText="Roll Number"> 
           <ItemTemplate> 
            <asp:TextBox ID="txtRollNumber" runat="server" Text='<%# Eval("RollNumber") %>' Visible='<%# Eval("ShowVisible") %>'></asp:TextBox> 
           </ItemTemplate> 
           <FooterTemplate> 
            <asp:TextBox ID="txtRollNumberF" runat="server"></asp:TextBox> 
           </FooterTemplate> 
          </asp:TemplateField> 
          <asp:TemplateField HeaderText="Admission Round"> 
           <ItemTemplate> 
            <asp:TextBox ID="txtAdmissionRound" runat="server" Text='<%# Eval("AdmissionRound") %>' Visible='<%# Eval("ShowVisible") %>'></asp:TextBox> 
           </ItemTemplate> 
           <FooterTemplate> 
            <asp:TextBox ID="txtAdmissionRoundF" runat="server"></asp:TextBox> 
           </FooterTemplate> 
          </asp:TemplateField> 
          <asp:TemplateField HeaderText="Marks Obtained"> 
           <ItemTemplate> 
            <asp:TextBox ID="txtMarksObtained" runat="server" Text='<%# Eval("MarksObtained") %>' Visible='<%# Eval("ShowVisible") %>'></asp:TextBox> 
           </ItemTemplate> 
           <FooterTemplate> 
            <asp:TextBox ID="txtMarksObtainedF" runat="server"></asp:TextBox> 
           </FooterTemplate> 
          </asp:TemplateField> 
          <asp:TemplateField HeaderText="Marks Out of"> 
           <ItemTemplate> 
            <asp:TextBox ID="txtMarksOutOf" runat="server" Text='<%# Eval("MarksOutOf") %>' Visible='<%# Eval("ShowVisible") %>'></asp:TextBox> 
           </ItemTemplate> 
           <FooterTemplate> 
            <asp:TextBox ID="txtMarksOutOfF" runat="server"></asp:TextBox> 
           </FooterTemplate> 
          </asp:TemplateField> 
          <asp:TemplateField HeaderText="Percentage"> 
           <ItemTemplate> 
            <asp:TextBox ID="txtPercentage" runat="server" Text='<%# Eval("Percentage") %>' Visible='<%# Eval("ShowVisible") %>'></asp:TextBox> 
           </ItemTemplate> 
           <FooterTemplate> 
            <asp:TextBox ID="txtPercentageF" runat="server"></asp:TextBox> 
           </FooterTemplate> 
          </asp:TemplateField> 
          <asp:TemplateField HeaderText="Remarks"> 
           <ItemTemplate> 
            <asp:TextBox ID="txtRemarks" runat="server" Text='<%# Eval("Remarks") %>' Visible='<%# Eval("ShowVisible") %>'></asp:TextBox> 
           </ItemTemplate> 
           <FooterTemplate> 
            <asp:TextBox ID="txtRemarksF" runat="server"></asp:TextBox> 
           </FooterTemplate> 
          </asp:TemplateField> 
          <asp:TemplateField> 
           <ItemTemplate> 
            <asp:Button ID="btnDeleteQualify" runat="server" Text="Delete" 
             Visible='<%# Eval("ShowVisible") %>' onclick="btnDeleteQualify_Click"></asp:Button> 
           </ItemTemplate> 
           <FooterTemplate> 
            <asp:Button ID="btnAddQualify" runat="server" Text="Add" 
             onclick="btnAddQualify_Click"></asp:Button> 
           </FooterTemplate> 
          </asp:TemplateField> 
         </Columns> 
        </asp:GridView>

实例 - 代码：

protected void Page_Load(object sender, EventArgs e) 
    { 
     if (!IsPostBack) 
     { 

      if (ViewState["QualifyDetails"] == null) 
       ViewState["QualifyDetails"] = new List<Entity_StudentAcademicQualify>(); 
      GridDataBindQualify((List<Entity_StudentAcademicQualify>)ViewState["QualifyDetails"]); 
     } 
    } 


    private void GridDataBindQualify(List<Entity_StudentAcademicQualify> list) 
    { 
     if (list.Count == 0) 
     { 
      Entity_StudentAcademicQualify studentQualify = new Entity_StudentAcademicQualify(); 

      studentQualify.ShowVisible = false; 
      studentQualify.QualifyingExam = string.Empty; 
      studentQualify.RollNumber = string.Empty; 
      studentQualify.AdmissionRound = string.Empty; 
      studentQualify.MarksObtained = 0; 
      studentQualify.MarksOutOf = 0; 
      studentQualify.Percentage = 0; 
      studentQualify.Remarks = string.Empty; 

      list.Add(studentQualify); 
     } 
     else 
     { 
      list.RemoveAt(0); 
     } 

     grdQualify.DataSource = list; 
     grdQualify.DataBind(); 

     ViewState["QualifyDetails"] = list; 
    } 

    protected void btnAddQualify_Click(object sender, EventArgs e) 
    { 
     GridViewRow row = (GridViewRow)((Button)sender).Parent.Parent; 

     List<Entity_StudentAcademicQualify> studentQualifys = 
      (List<Entity_StudentAcademicQualify>)ViewState["QualifyDetails"]; 

     Entity_StudentAcademicQualify studentQualify = new Entity_StudentAcademicQualify(); 

     studentQualify.ShowVisible = true; 
     studentQualify.QualifyingExam = ((TextBox)row.FindControl("txtQualifyingExamF")).Text; 
     studentQualify.RollNumber = ((TextBox)row.FindControl("txtRollNumberF")).Text; 
     studentQualify.AdmissionRound = ((TextBox)row.FindControl("txtAdmissionRoundF")).Text; 
     studentQualify.MarksObtained = Convert.ToInt32(((TextBox)row.FindControl("txtMarksObtainedF")).Text); 
     studentQualify.MarksOutOf = Convert.ToInt32(((TextBox)row.FindControl("txtMarksOutOfF")).Text); 
     studentQualify.Percentage = Convert.ToInt32(((TextBox)row.FindControl("txtPercentageF")).Text); 
     studentQualify.Remarks = ((TextBox)row.FindControl("txtRemarksF")).Text; 

     studentQualifys.Add(studentQualify); 

     GridDataBindQualify(studentQualifys); 
    } 

    protected void btnDeleteQualify_Click(object sender, EventArgs e) 
    { 
     List<Entity_StudentAcademicQualify> studentQualifys = 
      (List<Entity_StudentAcademicQualify>)ViewState["QualifyDetails"]; 

     studentQualifys.RemoveAt(((GridViewRow)((Button)sender).Parent.Parent).RowIndex); 

     GridDataBindQualify(studentQualifys); 
    }

来源

2013-07-16 05:24:22

1

我看了很多帖子在网上关于这一点，在它结束时，我想到了我自己的解决方案，可以满足我的需求，希望包括这个问题在内的其他人的需求。

需要显示页眉/页脚可能是因为 1）我想让用户看到网格的结构，并且 2）我想使用页脚向表中添加新数据。

因此，简单地示出了“无可用数据”是不够的。

所以我的解决方法是测试数据是否可用。如果不是，则创建数据源的结构并使用默认值填充一行所需的字段。这很重要，因为如果当布尔和日期等字段为空时将数据源绑定到网格，则会出现'DBNull'错误。然后将这个新的数据源绑定到网格。然后按此顺序隐藏该行。

Protected Sub BindGrid() 
    con = New SqlConnection("mainLocal") 
    Dim da As New SqlDataAdapter("SELECT * FROM Test", con) 
    Dim dt As New DataTable() 
    da.Fill(dt) 

    dim rows as integer = dt.Rows.Count 
    If rows = 0 Then 
     Dim dr As DataRow = Nothing 

     dr = dt.NewRow() 
     dr("isActive") = False 
     dr("Dated") = Date.Now() 
     dt.Rows.Add(dr) 
    End If 

    Me.TestGridView.DataSource = dt 
    Me.TestGridView.DataBind() 
    If rows = 0 Then Me.TestGridView.Rows(0).Visible = False 
End Sub

我想更简单，更短，整洁！

来源

2014-05-23 23:11:35

使用空数据源显示Gridview的页眉/页脚？

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