如何检测网格视图空单元格

how to detect grid view empty cell ? I need it for highlighting. So I made a css

如何检测网格视图空单元?我需要它来突出显示。所以我做了一个CSS

.RedColored 
{
    background: FF0000;
}

and trying to appear it to empty GV cells this way :

并尝试以这种方式将其显示为清空GV细胞:

protected virtual GridView1_RowDataBound (_sender : object,  e : System.Web.UI.WebControls.GridViewRowEventArgs) : void
        {
            e.Row.Cells[0].CssClass = "wide";
            foreach(i : int in [0..e.Row.Cells.Count-1])
            {
                when(e.Row.Cells[i].Text==null)
                {
                    e.Row.Cells[i].CssClass="RedColored";
                }
            }
        } 

but my it doesn't appears to empty cells , even I've tried Text=="" , Cell[i]==null, Cell[i].ToString()=="" and nothing helped.

但我似乎没有空单元格,即使我已经尝试了Text ==“”,Cell [i] == null,Cell [i] .ToString()==“”并没有任何帮助。

recoded to :            

def IsCellNull(cell : TableCell) : bool
            {
                | null => true
                | c => string.IsNullOrEmpty(c.ToString()) || c.GetType().Name == "DBNull"
        }

            foreach(i : int in [0..e.Row.Cells.Count-1])
            {
                when(IsCellNull(e.Row.Cells[i]))
                {
                    e.Row.Cells[i].Text="BLABLA";
                    e.Row.Cells[i].CssClass="RedColored";
                }
            }

But !!! It even doesn't helped , it works without WHEN, but when (if) can not find empty cells :P Finally : solved with this code :` e.Row.Cells[0].CssClass = "wide";

但是!!!它甚至没有帮助,它没有WHEN,但是当(if)找不到空单元时:P最后:用这个代码解决:`e.Row.Cells [0] .CssClass =“wide”;

        def IsCellNull(cell : TableCell) : bool
        {
            | null => true
            | c => string.IsNullOrEmpty(c.ToString()) 
            || c.GetType().Name == "DBNull" 
            || c.Text==" "
        }

        foreach(i : int in [0..e.Row.Cells.Count-1])
        {
            when(IsCellNull(e.Row.Cells[i]))
            {
                e.Row.Cells[i].BackColor=System.Drawing.Color.Red;
            }
        }`

4 个解决方案

#1

In some browsers, the cell will not display a color if it is empty. Adding a space in it solves this issue, but then it will no longer be empty...

在某些浏览器中,如果单元格为空,则单元格不会显示颜色。在其中添加空格可以解决此问题,但随后它将不再为空...

To test a cell, you should use string.IsNullOrEmpty():

要测试单元格,您应该使用string.IsNullOrEmpty():

when(string.IsNullOrEmpty(e.Row.Cells[i].Text))
{
  e.Row.Cells[i].Text=" "; // Or sometimes a no break space -   will work better
  e.Row.Cells[i].CssClass="RedColored";
}

#2

"When a bound GridView cell contains no data, ASP.NET fills it with   Hence the length of 6"

“当绑定的GridView单元格不包含任何数据时,ASP.NET会将其填充为”因此长度为6“

http://bytes.com/topic/asp-net/answers/768857-how-check-if-cell-gridview-empty

#3

I have wrote a utility function for this in the past, it is in VB.NET but should be pretty straighforward to convert to C#

我以前为此编写了一个实用程序函数,它在VB.NET中,但转换为C#应该非常简单

Public Shared Function IsCellBlank(ByVal cell As DataGridViewCell) As Boolean

公共共享函数IsCellBlank(ByVal cell As DataGridViewCell)作为布尔值

    If (cell.Value Is Nothing) Then
        Return True
    End If



    If (cell.Value.ToString().Length = 0)

Then

        Return True
    End If

    If (cell.Value.GetType().Name = "DBNull") Then
        Return True
    End If


    Return False
End Function

#4

Try this:

protected void grdList_RowDataBound(object sender, GridViewRowEventArgs e)
{
   if (e.Row.RowType == DataControlRowType.DataRow)
   {                
      if (e.Row.Cells[3].Text.Equals(" "))
      {
          e.Row.Cells[3].BackColor = Color.Red;
      }
   }
}