如何在点击编辑按钮时在gridview中获得文本框的值？

Question

Iam新的asp.net和我一直在尝试上述问题一段时间没有任何成功。这里是我的代码在roweditevent

GridView1.EditIndex = e.NewEditIndex; 
int newindex = e.NewEditIndex; 
TextBox NAME = GridView1.Rows[newindex].FindControl("txtboxname") as TextBox; 
string gridupdat = NAME.Text; 

但在调试我总是得到空引用那里。

这是我行的更新代码，它工作正常

Label ID = GridView1.Rows[e.RowIndex].FindControl("ID") as Label; 
    TextBox NAME = GridView1.Rows[e.RowIndex].FindControl("txtboxname") as TextBox; 
    DropDownList STATUS = GridView1.Rows[e.RowIndex].FindControl("dropdownstatus") as DropDownList; 
    string string1 = NAME.Text; 
    if (fetchmail(string1, labelgrid999) == true) 
    { 
     string updatquery = string.Format("UPDATE Compliance_Tracker.dbo.verificationMaster SET NAME='{0}',STATUS='{1}' WHERE ID = {2}", NAME.Text, STATUS.Text, Convert.ToInt32(ID.Text)); 
     string dupquery = "select COUNT(*) from Compliance_Tracker.dbo.verificationMaster where Compliance_Tracker.dbo.verificationMaster.NAME = '" + NAME.Text + "';"; 
     if (obj4.isDuplicate(dupquery) == false) 
     { 
      GridView1.EditIndex = -1; 
      string populatequery = updatquery + ";select NAME,(case when STATUS='1' then 'Active' when STATUS='0'then 'Inactive' ELSE 'UNKNOWN' END)as STATUS,ID from Compliance_Tracker.dbo.verificationMaster;"; 
      obj4.BindGridData(populatequery, GridView1); 
     } 
     else 
     { 
      ClientScript.RegisterStartupScript(this.GetType(), "myalert", "alert('" + "Username already exists" + "');", true); 
     } 
    } 
    else 
    { 
     string myStringVariable = "Please enter valid username"; 
     ClientScript.RegisterStartupScript(this.GetType(), "myalert", "alert('" + myStringVariable + "');", true); 
    } 

Answer 1

这是当我尝试获取的编辑按钮单击从文本框的数据我做什么：

<asp:TemplateField HeaderText="Edit"> 
    <ItemTemplate> 
     <asp:Button ID="BtnEdit" CausesValidation="false" runat="server" Text="Update" CommandName="updateData" CommandArgument='<%# Eval("ID") %>' /> 
    </ItemTemplate> 
</asp:TemplateField> 
<asp:TemplateField HeaderText="Product Price"> 
    <ItemTemplate> 
     <asp:TextBox ID="TxtPriceEdit" runat="server" Text='<%# Eval("Product_Price") %>' Width="120px"></asp:TextBox> 
    </ItemTemplate> 
</asp:TemplateField> 

代码背后：

protected void GrdDataEdit_RowCommand(object sender, GridViewCommandEventArgs e) 
{ 
    if (e.CommandName == "updateData") 
    { 
     // This will give you the ID of the record you are passing in the CommandArgument='<%# Eval("ID") %>' 
     int i = Convert.ToInt32(e.CommandArgument); 

     GridViewRow row = (GridViewRow)(((Button)e.CommandSource).NamingContainer); 
     TextBox price = (TextBox)row.FindControl("TxtPriceEdit"); 
    } 
} 

Answer 2

在行数据绑定事件跟踪行状态，并进行必要的调用来获取所需的控制的GridViewRow对象上调用FindControl()的参考。从here

Answer 3

采取

protected void gvMaint_RowDataBound(Object sender, GridViewRowEventArgs e) 
{ 
    if(e.Row.RowState == DataControlRowState.Edit) 
    { 
     TextBox txtFreqMiles = (TextBox)e.Row.FindControl("txtFreqMiles"); 

     // At this point, you can change the value as normal 
     txtFreqMiles.Text = "some new text"; 
    } 
} 

代码本GridViewEventArgs具有行的索引被编辑。它看起来并不像使用事件参数中的索引。试试这个：

protected void edit(object sender, GridViewEditEventArgs e)   
{ 

    string gridupdat = GridView1.Rows[e.NewEditIndex].Cells[0].Text; 
    // where Cells[0] = the index of your "txtboxname" column 
}