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嗨 coder 我有一个搜索用户页面，其中有一个 texbox、按钮和一个 gridview。现在，当我输入用户名并单击搜索按钮时，我会得到用户的详细信息。

我的数据库是这样的

在此处输入图像描述

我已经在页面加载时绑定了我的gridview，这样我也可以在gridview中查看用户的详细信息，如下所示：

在此处输入图像描述

现在在这个 gridview 中，您可以看到一个 IsEnable 标头，它具有复选框控件。Enable 有点在创建用户时总是正确的。

我想要的是当用户单击该复选框时该位变为假我在行数据绑定上尝试此操作但它给了我对象引用错误你们能告诉我当用户选择该复选框时我做了什么使我的位变为假

请提前帮助我

现在这就是我现在用我的代码所做的现在告诉我如何在行更新时将我的启用位从 true 更新为 false

 protected void Page_Load(object sender, EventArgs e)
{
    if (!Page.IsPostBack)
    {
        this.GetGridData();
    }
}
protected void BindGrid()
{
    con.Open();
    SqlCommand cmd = new SqlCommand("Select * from CreateUser", con);
    SqlDataAdapter da = new SqlDataAdapter(cmd);
    DataSet ds = new DataSet();
    da.Fill(ds);
    con.Close();
    if (ds.Tables[0].Rows.Count > 0)
    {
        GridView1.DataSource = ds;
        GridView1.DataBind();
    }
    else
    {
        ds.Tables[0].Rows.Add(ds.Tables[0].NewRow());
        GridView1.DataSource = ds;
        GridView1.DataBind();
        int columncount = GridView1.Rows[0].Cells.Count;
        GridView1.Rows[0].Cells.Clear();
        GridView1.Rows[0].Cells.Add(new TableCell());
        GridView1.Rows[0].Cells[0].ColumnSpan = columncount;
        GridView1.Rows[0].Cells[0].Text = "No Records Found";
    } 
}
private void GetGridData()
{
    con.Open();
    string query = "Select * from CreateUser";
    da = new SqlDataAdapter(query, con);
    DataSet ds = new DataSet();
    da.Fill(ds);
    GridView1.DataSource = ds;
    GridView1.DataBind();
    con.Close();
}
protected void btnSearchUser_Click(object sender, EventArgs e)
{
    this.BindGrid();
}
protected void lnkdelete_Click(object sender, EventArgs e)
{
    LinkButton lnkbtn = sender as LinkButton;
    //getting particular row linkbutton
    GridViewRow gvrow = lnkbtn.NamingContainer as GridViewRow;
    //getting userid of particular row
    int UserID = Convert.ToInt32(GridView1.DataKeys[gvrow.RowIndex].Value.ToString());
    string FirstName = gvrow.Cells[0].Text;
    con.Open();
    SqlCommand cmd = new SqlCommand("delete from CreateUser where UserID=" + UserID, con);
    int result = cmd.ExecuteNonQuery();
    con.Close();
    if (result == 1)
    {
        BindGrid();
        //Displaying alert message after successfully deletion of user
        ScriptManager.RegisterStartupScript(this, this.GetType(), "alertmessage", "javascript:alert('" + FirstName + " details deleted successfully')", true);
        this.GetGridData();
    }
}
protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
{
    //if (e.Row.RowType == DataControlRowType.DataRow)
    //{
    //    //getting username from particular row
    //    string FirstName = Convert.ToString(DataBinder.Eval(e.Row.DataItem, "FirstName"));
    //    //identifying the control in gridview
    //    LinkButton lnkbtnresult = (LinkButton)e.Row.FindControl("lnkdelete");
    //    //raising javascript confirmationbox whenver user clicks on link button
    //    lnkbtnresult.Attributes.Add("onclick", "javascript:return ConfirmationBox('" + FirstName + "')");
    //}
}
protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
    GridView1.PageIndex = e.NewPageIndex;
    GetGridData();
}
protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
    GridViewRow row = (GridViewRow)GridView1.Rows[e.RowIndex];
    Label userid= (Label)row.FindControl("lblUserID");
    con.Open();
    SqlCommand cmd = new SqlCommand("delete FROM CreateUser where UserID='" + Convert.ToInt32(GridView1.DataKeys[e.RowIndex].Value.ToString()) + "'", con);
    cmd.ExecuteNonQuery();
    con.Close();
    BindGrid();
}
protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
    GridView1.EditIndex = e.NewEditIndex;
    BindGrid();
}
protected void GridView1_RowUpdating1(object sender, GridViewUpdateEventArgs e)
{
    string query = string.Empty;
    string userid = GridView1.DataKeys[e.RowIndex].Values["UserID"].ToString();
    //Label id = GridView1.Rows[e.RowIndex].FindControl("lblUserID") as Label;
    TextBox FirstName = GridView1.Rows[e.RowIndex].FindControl("txtFirstName") as TextBox;
    TextBox LastName = GridView1.Rows[e.RowIndex].FindControl("txtLastName") as TextBox;
    TextBox DomainID = GridView1.Rows[e.RowIndex].FindControl("txtDomainID") as TextBox;
    TextBox EmailID = GridView1.Rows[e.RowIndex].FindControl("txtEmailID") as TextBox;
    TextBox Password = GridView1.Rows[e.RowIndex].FindControl("txtPassword") as TextBox;
    TextBox ConfirmPassword = GridView1.Rows[e.RowIndex].FindControl("txtConfirmPassword") as TextBox;
    TextBox RoleType = GridView1.Rows[e.RowIndex].FindControl("txtRoleType") as TextBox;
    CheckBox IsEnable = GridView1.Rows[e.RowIndex].FindControl("chkIsEnableEdit") as CheckBox;
    //TextBox textadd = (TextBox)row.FindControl("txtadd");
    //TextBox textc = (TextBox)row.FindControl("txtc");
    GridView1.EditIndex = -1;
    con.Open();
    //SqlCommand cmd = new SqlCommand("SELECT * FROM detail", conn);
    SqlCommand cmd = new SqlCommand("update CreateUser set FirstName='" + FirstName.Text + "',LastName='" + LastName.Text + "',DomainID='" + DomainID.Text + "',EmailID='" + EmailID.Text + "',Password='" + Password.Text + "',ConfirmPassword='" + ConfirmPassword.Text + "',RoleType='" + RoleType.Text + "',Enable='" + IsEnable.Checked + "' where UserID='" + userid + "'", con);
    cmd.ExecuteNonQuery();
    con.Close();
    BindGrid();
    //GridView1.DataBind();
}
protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
{
    GridView1.EditIndex = -1;
    BindGrid();
}

}

4

3 回答 3

1

先放一些防御性代码，找出对象引用错误发生在哪里：

protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
 {
     if(e.Row.RowType == DataControlRowType.DataRow)
     {
        var chk = (CheckBox)e.Row.FindControl("chkEnable");
        if (chk == null || !chk.checked) return; 
        var userId  =GridView1.DataKeys[row.RowIndex].Value as string;
        if (string.IsNullOrWhiteSpace(userId)) return;
        var query = "update CreateUser set Enable='False' where UserID='" + userid + "'";
        cmd = new SqlCommand(query, con);
        cmd.CommandType = CommandType.Text;
        cmd.ExecuteNonQuery();
        con.Close();
      }
}

您可以使用 CheckChanged 事件：

<asp:GridView ID="GridView1" runat="server" onrowcommand="GridView1_RowCommand">
    <Columns>
        <asp:TemplateField>
            <ItemTemplate>
                <asp:CheckBox ID="chkEnable" runat="server" AutoPostBack="true"  OnCheckedChanged="ChkEnable_CheckedChanged" />
            </ItemTemplate>
        </asp:TemplateField>
    </Columns>
</asp:GridView>

然后在 CheckChanged 事件中更新数据库：

protected void ChkEnable_CheckedChanged(object sender, EventArgs e)
{
  int selRowIndex = ((GridViewRow)(((CheckBox)sender).Parent.Parent)).RowIndex;
  var userId = gridView.DataKeys[selRowIndex].Value as string;
  if (string.IsNullOrWhiteSpace(userId)) return;
  var checkBox = gridView.Rows[selRowIndex].FindControl("chkEnable") as CheckBox;
  if (checkBox == null) return;
  var query = "update CreateUser set Enable= @Enabled where UserID='" + userid + "'";
  cmd = new SqlCommand(query, con);
  cmd.CommandType = CommandType.Text;
  cmd.Parameters.AddWithValue("Enabled", checkBox.Checked);
  cmd.ExecuteNonQuery();
  con.Close();

}
于 2013-09-23T16:09:34.190 回答
0

首先，您为什么要在RowDataBound活动中这样做？当一行绑定到 gridview 时会发生 RowDataBound，但在这里我们必须更新 gridview 行。如果你必须更新你的行，你可以在RowUpdatingcommand 上做。 

  protected void GridView1_RowUpdating(object sender, GridViewUpdateEventArgs e)
       {       

           Checkbox chkbx = ((Checkbox)(row.Cells[8].Controls[0]));
           bool IsChecked =chkbx.Checked ;           
           //You can write your update command here.
       }



 protected void GridView1_RowDataBound(object sender, GridViewRowEventArgs e)
     {
          GridViewRow row = GridView1.Rows[e.RowIndex];
        if (e.Row.RowType == DataControlRowType.DataRow)
            {

           TextBox MyName= (TextBox)e.Row.FindControl("FirstName");

           string name = Myname.text; 
          //For checkbox
           Checkbox chkbx = (Checkbox)e.Row.FindControl("IsEnabled");

           if(chkbx.Checked ==true) 
            {
                // do your stuff for checkbox checked.
            }
           else
             {
                // do your stuff if checkbox is not selected
              }
           }
    }
于 2013-09-23T16:47:08.297 回答
0

终于有答案了 谢谢各位的回复

protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
    this.GetGridData();
}
}
 protected void BindGrid()
{
con.Open();
SqlCommand cmd = new SqlCommand("Select * from CreateUser", con);
SqlDataAdapter da = new SqlDataAdapter(cmd);
DataSet ds = new DataSet();
da.Fill(ds);
con.Close();
if (ds.Tables[0].Rows.Count > 0)
{
    GridView1.DataSource = ds;
    GridView1.DataBind();
}
else
{
    ds.Tables[0].Rows.Add(ds.Tables[0].NewRow());
    GridView1.DataSource = ds;
    GridView1.DataBind();
    int columncount = GridView1.Rows[0].Cells.Count;
    GridView1.Rows[0].Cells.Clear();
    GridView1.Rows[0].Cells.Add(new TableCell());
    GridView1.Rows[0].Cells[0].ColumnSpan = columncount;
    GridView1.Rows[0].Cells[0].Text = "No Records Found";
} 
}
  private void GetGridData()
  {
   con.Open();
   string query = "Select * from CreateUser";
   da = new SqlDataAdapter(query, con);
   DataSet ds = new DataSet();
   da.Fill(ds);
   GridView1.DataSource = ds;
   GridView1.DataBind();
   con.Close();
  }
protected void btnSearchUser_Click(object sender, EventArgs e)
{
    this.BindGrid();
}
protected void lnkdelete_Click(object sender, EventArgs e)
{
    LinkButton lnkbtn = sender as LinkButton;
    //getting particular row linkbutton
    GridViewRow gvrow = lnkbtn.NamingContainer as GridViewRow;
    //getting userid of particular row
    int UserID = Convert.ToInt32(GridView1.DataKeys[gvrow.RowIndex].Value.ToString());
    string FirstName = gvrow.Cells[0].Text;
    con.Open();
    SqlCommand cmd = new SqlCommand("delete from CreateUser where UserID=" + UserID, con);
    int result = cmd.ExecuteNonQuery();
    con.Close();
    if (result == 1)
   {
       BindGrid();
       //Displaying alert message after successfully deletion of user
       ScriptManager.RegisterStartupScript(this, this.GetType(), "alertmessage", "javascript:alert('" + FirstName + " details deleted successfully')", true);
       this.GetGridData();
   }
}


protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
GridView1.PageIndex = e.NewPageIndex;
GetGridData();
}
 protected void GridView1_RowDeleting(object sender, GridViewDeleteEventArgs e)
{
GridViewRow row = (GridViewRow)GridView1.Rows[e.RowIndex];
Label userid= (Label)row.FindControl("lblUserID");
con.Open();
SqlCommand cmd = new SqlCommand("delete FROM CreateUser where UserID='" + Convert.ToInt32(GridView1.DataKeys[e.RowIndex].Value.ToString()) + "'", con);
cmd.ExecuteNonQuery();
con.Close();
BindGrid();
}
 protected void GridView1_RowEditing(object sender, GridViewEditEventArgs e)
{
    GridView1.EditIndex = e.NewEditIndex;
    BindGrid();
}
protected void GridView1_RowUpdating1(object sender, GridViewUpdateEventArgs e)
{
string query = string.Empty;
string userid = GridView1.DataKeys[e.RowIndex].Values["UserID"].ToString();
//Label id = GridView1.Rows[e.RowIndex].FindControl("lblUserID") as Label;
TextBox FirstName = GridView1.Rows[e.RowIndex].FindControl("txtFirstName") as TextBox;
TextBox LastName = GridView1.Rows[e.RowIndex].FindControl("txtLastName") as TextBox;
TextBox DomainID = GridView1.Rows[e.RowIndex].FindControl("txtDomainID") as TextBox;
TextBox EmailID = GridView1.Rows[e.RowIndex].FindControl("txtEmailID") as TextBox;
TextBox Password = GridView1.Rows[e.RowIndex].FindControl("txtPassword") as TextBox;
TextBox ConfirmPassword = GridView1.Rows[e.RowIndex].FindControl("txtConfirmPassword") as TextBox;
TextBox RoleType = GridView1.Rows[e.RowIndex].FindControl("txtRoleType") as TextBox;
CheckBox IsEnable = GridView1.Rows[e.RowIndex].FindControl("chkIsEnableEdit") as CheckBox;
//TextBox textadd = (TextBox)row.FindControl("txtadd");
//TextBox textc = (TextBox)row.FindControl("txtc");
GridView1.EditIndex = -1;
con.Open();
//SqlCommand cmd = new SqlCommand("SELECT * FROM detail", conn);
SqlCommand cmd = new SqlCommand("update CreateUser set FirstName='" + FirstName.Text + "',LastName='" + LastName.Text + "',DomainID='" + DomainID.Text + "',EmailID='" + EmailID.Text + "',Password='" + Password.Text + "',ConfirmPassword='" + ConfirmPassword.Text + "',RoleType='" + RoleType.Text + "',Enable='" + IsEnable.Checked + "' where UserID='" + userid + "'", con);
cmd.ExecuteNonQuery();
con.Close();
BindGrid();
//GridView1.DataBind();
}
 protected void GridView1_RowCancelingEdit(object sender, GridViewCancelEditEventArgs e)
{
GridView1.EditIndex = -1;
BindGrid();
}
}
于 2013-09-25T12:12:59.583 回答