如何检查没有检查DataGridViewCheckBoxColumn的行 [英] how to check that no row of DataGridViewCheckBoxColumn has been checked

问题描述

如何检查没有检查DataGridViewCheckBoxColumn的行



datagridview 4列和x个行添加



第一列是DataGridViewCheckBoxColumn



i想知道没有一行复选框列是检查

how to check that no row of DataGridViewCheckBoxColumn has been checked

in datagridview 4 columns and x nos of rows added

1st column is DataGridViewCheckBoxColumn

i want to know that not a single row of checkbox column is check

推荐答案

从你的问题我假设两种可能性：



1）当DataGridView是 NOT 数据绑定时：



AFAIK，我们无法通过DataGridViewRowCollection获取行单元格的值。



一种方法是使用循环：

From your question I assume two possibilities:

1) When DataGridView is NOT databound:

AFAIK, we can not get the values of a row cell(s) without looping through DataGridViewRowCollection.

One way to do so is using loop:

Dim cnt As Integer = 0
For i As Integer = 0 To DataGridView1.Rows.Count - 1
    With DataGridView1.Rows(i).Cells("NameOfYourColumn")
        If (.Value = True) Then
            cnt += 1
            Exit For
        End If
    End With
Next
Debug.Print(cnt) ' If here it is greater than zero than some row is checked

使用LINQ :( 一行a pproach ）

using LINQ: (one line approach)

DataGridView1.Rows.Cast(Of DataGridViewRow).Where(Function(c) c.Cells("NameOfYourColumn").Value = True).Count() 
' If count > 0 then some row is checked

2。如果DataGridView是数据绑定：



我们可以使用DataView [ ^ ]类或 DataTable.Select [< a href =http://msdn.microsoft.com/en-us/library/det4aw50.aspxtarget =_ blanktitle =New Window> ^ ]方法。请参阅所附链接中的示例。

2. If DataGridView is databound:

We can make use of DataView[^] class or DataTable.Select[^] method. See the examples in the attached link.

试试这个：

try this :

dim x as integer = 0
for counter as integer = 0 to datagrid.rows.count -1
   if datagrid.rows(counter).cells(0).value = true then
      x = 1
      exit for
   else
      x = 0
   end if

if x = 0
    MessageBox.Show("No records selected.", "Null Value",                               MessageBoxButtons.OK,MessageBoxIcon.Information)
            Exit Sub
end if

我为此编写了简单的解决方案

i coded the easy solution for this

Dim chkCOl As Boolean = False
     For i As Integer = 0 To dgvInv.Rows.Count - 1
         If dgvInv(1, i).Value = True Then
             chkCOl = True
' if any of row is checked  will com in this if condition 
'else i will get chkCOl  as false
              Exit For
         End If
     Next

其中dgvInv是我的datagridview

where dgvInv is my datagridview

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