Question

我想知道是否有人可以帮助我使用此代码。我想要做的是从数据库中读取记录并在gridview上显示它们。不过我网格的最后一列是TemplateField，我点击后会显示ImageButton来执行某些操作。

我的问题是：

仅当网格的特定单元格为值ImageButton时，如何显示true。当值为ImageButton时，我试图将false设置为false，但它无法正常工作

请帮助

private void BindCustomDateBookings()
{
    try
    {

        String queryCustomDateBookings = "Select * from bookings";
        //Creates a connection to the database
        SqlConnection connectionViewBookings = new SqlConnection(connectionString);
        //Query builder
        SqlDataAdapter dataAdapterViewBookings = new SqlDataAdapter(queryCustomDateBookings, connectionViewBookings);
        dataAdapterViewBookings.SelectCommand.Parameters.AddWithValue("@customDate", customDate);

        //Create the data that will hold the result of DB
        DataSet dataSetViewTodaysBookings = new DataSet();

        //open, save results and close connection
        connectionViewBookings.Open();
        dataAdapterViewBookings.Fill(dataSetViewTodaysBookings);
        connectionViewBookings.Close();

        //fill the grid with results
        GridViewCustomDate.DataSource = dataSetViewTodaysBookings.Tables[0];
        GridViewCustomDate.DataBind();
     }
    catch (SqlException SqlExceptionTomorrow)
    {
        Response.Write(@"<SCRIPT LANGUAGE=""JavaScript"">alert('Could not connect to the database This date bookings')</SCRIPT>");
    }  
}//Ends Bind Custom Date bookings

网格视图具有以下编码

<asp:GridView ID="GridViewCustomDate" runat="server" AutoGenerateColumns="False" CssClass="viewBookingTable" GridLines="None"  
             HeaderStyle-CssClass="gridViewHeader">
             <HeaderStyle CssClass="gridViewHeader" />
             <RowStyle CssClass="GridViewRowStyle" />
             <AlternatingRowStyle CssClass="GridViewAlternatingRowStyle " />

              <Columns>
                  <asp:BoundField DataField="bookingID" ItemStyle-CssClass="displayGridViewID" 
                      HeaderStyle-CssClass="displayGridViewID" >
                  <HeaderStyle CssClass="displayGridViewID" />
                  <ItemStyle CssClass="displayGridViewID" />
                  </asp:BoundField>
             <asp:BoundField DataField="visitorName" HeaderText="Visitor Name" />
             <asp:BoundField DataField="contactNo" HeaderText="contactNo" />
             <asp:BoundField DataField="hostName" HeaderText="Host Name" />
             <asp:BoundField DataField="roomName" HeaderText="Room Name" />
             <asp:BoundField DataField="timeIn" HeaderText="Time In" />
             <asp:BoundField DataField="smartCardNo" HeaderText="Smart Card No" />
                  <asp:TemplateField HeaderText="Required Access">
                      <ItemTemplate>
                          <asp:ImageButton ID="btnGetRequiredAccessCustomDate" runat="server" 
                              ImageUrl="~/images/buttons/clickMe.png" 
                              onclick="btnGetRequiredAccessCustomDate_Click" />
                      </ItemTemplate>
                  </asp:TemplateField>
              </Columns>             

        </asp:GridView>

Answer 1

您可以将asp：ImageButton的Visible属性绑定到数据集中的布尔值。 e.g。

<asp:ImageButton ID="btnGetRequiredAccessCustomDate" runat="server" 
    Visible=<%# Eval("ShowImage") %>
    ImageUrl="~/images/buttons/clickMe.png" 
    onclick="btnGetRequiredAccessCustomDate_Click" />

Answer 2

使用gridview中的OnDataBound属性。您的gridview初始化将是，

<asp:GridView ID="GridViewCustomDate" runat="server" AutoGenerateColumns="False" CssClass="viewBookingTable" GridLines="None"  OnDataBound="GridViewCustomDate_DataBound"
             HeaderStyle-CssClass="gridViewHeader">
             <HeaderStyle CssClass="gridViewHeader" />
             <RowStyle CssClass="GridViewRowStyle" />
             <AlternatingRowStyle CssClass="GridViewAlternatingRowStyle " />

在后面的代码中处理数据绑定事件，如下所示。

public void GridViewCustomDate_DataBound(object send, EventArgs e)
{
     for (int i = 0; i < GridViewCustomDate.Rows.Count; i++)
     {
         if( condition) // the condition for which you want to check true of false
        GridViewCustomDate.Rows[i].Cells[7].Visible = false; //the cells[7] indicates the last cell. replace with appropriate cell number.
     }
}

DataBound 方法将在gridview的数据绑定之后以及在页面上呈现之前调用。因此，如果if条件失败，则单元格将为空。如果条件满足，则带有按钮的单元格将显示。

基本上，您为所有行渲染按钮，并在databind之后动态隐藏它。

Answer 3

使用数据绑定和转换器？

<asp:ImageButton ID="btnGetRequiredAccessCustomDate" runat="server" 
    Visibility={Binding FieldThatControlsVisibility, Converter={StaticResource ConverterForFieldThatReturnsVisibility}}
    ImageUrl="~/images/buttons/clickMe.png" 
    onclick="btnGetRequiredAccessCustomDate_Click" />

（语法可能不正确，因为曾经在xaml中工作，但快速搜索显示ImageButton的Visibility属性是一个可绑定属性。

如何根据Cell值在GridView上动态显示按钮

3 个答案: