如何在每一行中获取复选框的值？ [英] How to get value of checkbox in each row?

问题描述

这是UI

< asp：GridView ID =   gvSecurity 
 runat =   server 
 AutoGenerateColumns =   False CellPadding =   3 
 OnPageIndexChanging =   gvSecurity_PageIndexChanging  
 OnRowDeleting =   gvSecurity_RowDeleting 
 onrowcommand =   gvSecurity_RowCommand 
 OnSelectedIndexChanged =  < span class =code-string> gvSecurity_SelectedIndexChanged 
 AllowPaging =   True 
 Horizo​​ntalAlign =  对齐 
 Width =   100％ 
 
 CssClass =   avoGrid 
 PagerStyle-CssClass =   avoGridPgr 
 AlternatingRowStyle-CssClass =   avoGridAlt AllowSorting =   True >  
 
< ; AlternatingRowStyle CssClass =   avoGridAlt >  < /   AlternatingRowStyle  >  
 
< Columns> 
< asp：BoundField DataField =   szSecurityItemId ItemStyle-Horizo​​ntalAlign =   Left 
 HeaderStyle-Horizo​​ntalAlign =  左 HeaderText =  安全项目 >  
< HeaderStyle Horizo​​ntalAlign =  左 >  < /   HeaderStyle  >  
< ItemStyle Horizo​​ntalAlign =   Left >  < /   ItemStyle  >  
 < /   asp：BoundField  >  
< asp：BoundField DataField =   szDescription ItemStyle-Horizo​​ntalAlign =  左 
 HeaderStyle-Horizo​​ntalAlign =   Left HeaderText =   Deskripsi >  
< HeaderStyle Horizo​​ntalAlign =   Left >  < /   HeaderStyle  > ;  
< ItemStyle Horizo​​ntalAlign =  左 >  < /   ItemStyle  >  
 < /   asp：BoundField  >  
< asp：templatefield HeaderText =  值 >  
< itemtemplate> 
< asp：CheckBox ID =   ckbValue runat =   server oncheckedchanged =   gvSecurity_SelectedIndexChanged CssClass =   pkchkbox Checked = ' <％＃Eval（szValue）== DBNull.Value？ false：Convert.ToBoolean（Eval（szValue））％>' >  < /   asp：CheckBox  >  
 < /   itemtemplate  >  
 < /   asp：templatefield  >  
 < /  列 >  
< ; PagerStyle CssClass =   avoGridPgr >  < /   PagerStyle  >  
 < /   asp：GridView  >  

这是CodeProgram < pre lang =c＃> private DataTable m_dt;
int index;
CheckBox chk = null ;

foreach （DataRow dr in m_dt.Rows）
{
string szValue =（ string ）dr [ szValue];
string szGroupId =（ string ）dr [ szSecurityItemId];
item = new SecurityItemData（）;

for （ int i = 0 ; i < gvSecurity.Rows.Count; i ++）
{
chk =（CheckBox）gvSecurity.Rows [ i] .FindControl（ ckbValue）;


item.szSecurityItemId =（ string ）dr [ szSecurityItemId];
if （szValue.ToLower（）== true）
{
if （chk.Checked）
{
item.szValue = N;
}
else
{
item.szValue = Y;
}

}
else
{
if （chk.Checked）
{
item.szValue = Y;
}
else
{
item.szValue = N;
}
} // item.szValue = bVal？ Y：N;
}
dat.itemList.Add（item）;
}
return dat;
}

受保护 void gvSecurity_SelectedIndexChanged（ object sender，EventArgs e）
{
// 使用SelectedRow属性获取当前选定的行。
GridViewRow row =（（GridViewRow）（（CheckBox）sender）.NamingContainer）;
index = row.RowIndex;
}

请帮助我，因为当我保存复选框的值时，对应于所选的复选框。

解决方案

试试这样..

  foreach （GridViewRow row  in  gvSecurity.Rows）
 {
 CheckBox chk = row.FindControl（   ckbValue） as  CheckBox; 
  //  否则CheckBox chk =（CheckBox）row.FindControl（ckbValue）;  
 
  if （chk！=  null ）
 {
  if （chk.Checked）
 {
 item.szValue =   Y; 
} 
  else  
 {
 item.szValue =   N; 
} 
} 
 
} 

在您的代码中，您有以下片段：

  private  DataTable m_dt; 
  int  index; 
 CheckBox chk =  null ; 
 
  foreach （DataRow dr  in  m_dt.Rows）
。 
。 
。

因为你没有设置m_dt你没有数据（事实上，你没有m_dt所以它应该以对象未设置为实例错误而失败。当然，你的每一个都不会触发，其中的所有代码都不会执行。



所以，删除每个外部它应该工作。





如果这有帮助请花时间接受解决方案。谢谢。

在此行之前：

 chk =（CheckBox）gvSecurity.Rows [i] .FindControl（  ckbValue）; 
 

如果添加以下内容声明，

  if （gvSecurity.Rows [i] .RowType == DataControlRowType.DataRow）

如果问题没有解决，那么问题不在您展示的代码中



此外，什么是 dat obje ct你回来了，你在哪里使用它？

This is UI

<asp:GridView ID="gvSecurity" 
    runat="server" 
    AutoGenerateColumns="False" CellPadding="3" 
    OnPageIndexChanging="gvSecurity_PageIndexChanging"
    OnRowDeleting="gvSecurity_RowDeleting"
    onrowcommand="gvSecurity_RowCommand" 
    OnSelectedIndexChanged="gvSecurity_SelectedIndexChanged"
    AllowPaging="True"  
    HorizontalAlign="Justify" 
    Width="100%"
                    
    CssClass="avoGrid"
    PagerStyle-CssClass="avoGridPgr"
    AlternatingRowStyle-CssClass="avoGridAlt" AllowSorting="True">

    <AlternatingRowStyle CssClass="avoGridAlt"></AlternatingRowStyle>

        <Columns>                                                     
            <asp:BoundField DataField="szSecurityItemId" ItemStyle-HorizontalAlign="Left"  
                HeaderStyle-HorizontalAlign="Left" HeaderText="Security Item">                        
                <HeaderStyle HorizontalAlign="Left"></HeaderStyle>
                <ItemStyle HorizontalAlign="Left"></ItemStyle>
            </asp:BoundField>
            <asp:BoundField DataField="szDescription" ItemStyle-HorizontalAlign="Left"  
                HeaderStyle-HorizontalAlign="Left"  HeaderText="Deskripsi">
                <HeaderStyle HorizontalAlign="Left"></HeaderStyle>
                <ItemStyle HorizontalAlign="Left"></ItemStyle>
            </asp:BoundField> 
            <asp:templatefield HeaderText="Value">
                <itemtemplate>
                    <asp:CheckBox ID="ckbValue" runat="server" oncheckedchanged="gvSecurity_SelectedIndexChanged" CssClass="pkchkbox" Checked='<%# Eval("szValue") == DBNull.Value ? false : Convert.ToBoolean(Eval("szValue")) %>'></asp:CheckBox>
                </itemtemplate>
            </asp:templatefield>
        </Columns>        
    <PagerStyle CssClass="avoGridPgr"></PagerStyle>
</asp:GridView>

This is CodeProgram

private DataTable m_dt;
int index;
CheckBox chk = null;

 foreach (DataRow dr in m_dt.Rows)
            {
                string szValue = (string)dr["szValue"];
                string szGroupId = (string)dr["szSecurityItemId"];
                item = new SecurityItemData();
                
                for (int i = 0; i < gvSecurity.Rows.Count; i++)
                {
                    chk = (CheckBox)gvSecurity.Rows[i].FindControl("ckbValue");
                    
                    
                    item.szSecurityItemId = (string)dr["szSecurityItemId"];
                    if (szValue.ToLower() == "true")
                    {
                        if (chk.Checked)
                        {
                            item.szValue = "N";
                        }
                        else
                        {
                            item.szValue = "Y";
                        }
                        
                    }
                    else
                    {
                        if (chk.Checked)
                        {
                            item.szValue = "Y";
                        }
                        else
                        {
                            item.szValue = "N";
                        }
                    }                //item.szValue = bVal ? "Y" : "N";
                }
                dat.itemList.Add(item);
            }
            return dat;
        }

  protected void gvSecurity_SelectedIndexChanged(object sender, EventArgs e)
        {
            // Get the currently selected row using the SelectedRow property.
            GridViewRow row = ((GridViewRow)((CheckBox)sender).NamingContainer);
            index = row.RowIndex;
}

Please help me, because when i save value of checkbox doesn't not correspond to the selected checkboxes.

解决方案

Try like this..

foreach (GridViewRow row in gvSecurity.Rows)
{
  CheckBox chk= row.FindControl("ckbValue") as CheckBox ;
//else CheckBox  chk=(CheckBox)row.FindControl("ckbValue");

if(chk!=null)
{
if (chk.Checked)
   {
    item.szValue = "Y";
   }
  else
   {
    item.szValue = "N";
   }
}

}

In your code you have the following fragment:

private DataTable m_dt;
int index;
CheckBox chk = null;
 
 foreach (DataRow dr in m_dt.Rows)
.
.
.

Since you're not setting m_dt you have no data (in fact, you don't have m_dt so it should fail with "object not set to an instance" error. Definitely, your for each here will NOT trigger and all the code inside it will never execute.

So, remove the outer for each and it should work.


If this helps please take time to accept the solution. Thank you.

Before this line:

chk = (CheckBox)gvSecurity.Rows[i].FindControl("ckbValue");

add the following if statement,

if (gvSecurity.Rows[i].RowType == DataControlRowType.DataRow)

If the problem is not solved, then the issue is not in the code you displayed

Also, what is the dat object your are returning, where are you using it?

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