c# - 根据数据表值在gridview中设置复选框

Question

我有一个带有复选框字段和几个绑定(bind)字段的 gridview 控件。复选框字段不直接映射到数据库中的字段。相反，我想从数据库中的一个字段中读取一个值并“选中”一些复选框。

例如，从数据库->数据表中给出以下数据

        PROCESSED   NAME             DATE            
            Y       Mickey Mouse     11/15/2011
            N       Donald Duck      4/01/2012
            Y       James Bond       5/02/2011

I would like the gridview to display a checkbox and set the value of boxes to UNCHECKED where PROCESSED = N and for PROCESSED = Y either have an uneditable checkbox or no checkbox at all.

        PROCESSED   NAME             DATE            
           [/]       Mickey Mouse     11/15/2011
           [ ]       Donald Duck      4/01/2012
           [/]       James Bond       5/02/2011

To populate the gridview, a SQL stmt is run against a database, and the result of the SQL query is stored in a datatable. Before binding the datatable to the gridview, i would like to check the "processed" field and set the checkbox based on that value.

Here is the gridview control (shortened for clarity):

<asp:GridView ID="gridview_all_applicants" runat="server" AllowPaging="True">
        <Columns>
          <asp:TemplateField HeaderText="Complete">
                <ItemTemplate>
                    <asp:CheckBox ID="process_flag" runat="server" />
                </ItemTemplate>
          </asp:TemplateField>
          <asp:BoundField DataField="lastname" HeaderText="Last Name" ReadOnly="True"  SortExpression="lastname" />

这是我到目前为止在后面的代码中的内容

 SqlCommand cmd = new SqlCommand(sql query here);
 SqlDataAdapter da = new SqlDataAdapter();
 DataTable dt = new DataTable();
 da.SelectCommand = cmd;
 // Save results of select statement into a datatable
 da.Fill(dt);
 foreach (DataRow r in dt.Rows)
 {
        // do some processing of data returned from query
        // read the char value from the returned data and set checkbox

             procflag = r["process_flag"].ToString().ToLower();
             CheckBox chkbox = new CheckBox();
             if (procflag == null || procflag == "n")
             {
                // SET CHECKBOX TO "NOT CHECKED"        

              }
              else
              {
                 // SET CHECKBOX TO "CHECKED" AND MAKE IT UNCLICKABLE
                 // ----OR---- DO NOT DISPLAY CHECKBOX AT ALL.

               }
     } // end for each


          gridview_all_applicants.DataSource = dt;
          gridview_all_applicants.DataBind(); 

非常感谢任何帮助。

Answer 1

你可以这样做:

首先在sql server中:

SELECT 
    CAST(CASE PROCESSED WHEN 'Y' THEN 1 ELSE 0 END AS BIT) AS PROCESSED
    NAME
    DATE
FROM ExampleTable

在 C# 代码中:

SqlCommand cmd = new SqlCommand(sql query here); 
SqlDataAdapter da = new SqlDataAdapter(); 
DataTable dt = new DataTable(); 
da.SelectCommand = cmd; 

// Save results of select statement into a datatable 
da.Fill(dt);

gridview_all_applicants.DataSource = dt;          
gridview_all_applicants.DataBind(); 

最后在 aspx 中:

<asp:TemplateField HeaderText="Complete">
<ItemTemplate>
    <asp:CheckBox ID="process_flag" runat="server" Checked='<%# bool.Parse(Eval("PROCESSED").ToString()) %>' Enable='<%# !bool.Parse(Eval("PROCESSED").ToString()) %>'/>
</ItemTemplate>