How to check if a column with a given name exists in a datarow

问题

I want to insert a value from loop in datarow so before entering value in datarow, I want to check that a perticular column NAME exist in table or not.

Please tell me how can I check it. (vb.net preferred).

回答1:

I got the answer.and its working . its:

  If dr.Table.Columns.Contains("columnname") = True Then
   --your work---
  End If

回答2:

Try this

Dim dt As New DataTable
For Each dc As DataColumn In dt.Columns
    If dc.ColumnName = "" Then

    End If
Next

回答3:

try:

if dr.Table.Columns("nameColumn") == null then

 //....

回答4:

The shortest solution.

 If dr.Table.Columns.Contains("columnname") Then
     'your code here
 End If

回答5:

Here is another way to find out if a column exists:

If dataRow.Table.Columns("ColumnName") IsNot Nothing Then
    -- Your code if a column exists
End If

See this answer for further reference when this approach might be handier than the Contains("ColumnName") one.

来源：https://stackoverflow.com/questions/1984893/how-to-check-if-a-column-with-a-given-name-exists-in-a-datarow