vb.net 如何检查数据行中是否存在具有给定名称的列
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How to check if a column with a given name exists in a datarow
提问by Dr. Rajesh Rolen
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).
我想在数据行中从循环中插入一个值,因此在数据行中输入值之前,我想检查表中是否存在特定列 NAME。
请告诉我如何检查。(vb.net 首选)。
回答by Dr. Rajesh Rolen
I got the answer.and its working . its:
我得到了答案。它的工作原理。它的:
If dr.Table.Columns.Contains("columnname") = True Then
--your work---
End If
回答by Anuraj
Try this
尝试这个
Dim dt As New DataTable
For Each dc As DataColumn In dt.Columns
If dc.ColumnName = "" Then
End If
Next
回答by Leidr Garcia
try:
尝试:
if dr.Table.Columns("nameColumn") == null then //....
回答by Quethzel Díaz
The shortest solution.
最短的解决方案。
If dr.Table.Columns.Contains("columnname") Then
'your code here
End If
回答by Alexander Abakumov
Here is another way to find out if a column exists:
这是确定列是否存在的另一种方法:
If dataRow.Table.Columns("ColumnName") IsNot Nothing Then
-- Your code if a column exists
End If
See this answerfor further reference when this approach might be handier than the Contains("ColumnName")
one.
当这种方法可能比方法更方便时,请参阅此答案以获取进一步参考Contains("ColumnName")
。