C# 如何使用 DataTable.Select() 选择 Null/空值?
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how to use DataTable.Select() to select Null/ empty values?
提问by haansi
My data table filled from db is having empty values in some cells.
我从 db 填充的数据表在某些单元格中有空值。
The results database SP return has Null in them but in DataTable these values are appearing as '' or empty cells.
结果数据库 SP 返回的结果为 Null,但在 DataTable 中,这些值显示为 '' 或空单元格。
Please guide me how to use Select() to select these dbnull/ empty rows.
请指导我如何使用 Select() 来选择这些 dbnull/空行。
Thanks
谢谢
采纳答案by Thit Lwin Oo
For one column
对于一列
DataRow rows = DataTable.Select("[COLUMN 1]=''");
For more than one column
对于不止一列
DataRow rows = DataTable.Select("[COLUMN 1]='' OR [COLUMN 2]=''");
回答by James McG
The correct way to check for null is to check for it:
检查 null 的正确方法是检查它:
DataRow[] myResultSet = myDataTable.Select("[COLUMN NAME] is null");

