Testing equality of DataColumn values in C#

Question

I've written some code to test equality between column values in DataTables when the column type isn't known.

Testing directly like this:

row["Foo"] == row["Bar"]

always results in false, presumably because object's implementation of Equals uses ReferenceEquals.

So I've resorted to:

row["Foo"].ToString() == row["Bar"].ToString()

This works (at least for the cases I've encountered so far), but it seems a little, well, manky.

Can anyone think of a reason I shouldn't do it this way, or suggest a better way? Remember I don't know the column types at design time, so casting is not an option.

Thanks

David

Answer 1

Try row["Foo"].Equals(row["bar"]) .

When you compare objects using == and there is no predefined or user-defined == operator, C# will compare them using reference equality. If you want to call the Equals method, you need to write it out as a method call.

Answer 2

row["Foo"].Equals(row["Bar"])吗？

Answer 3

如果它们是字符串，为什么不使用等于。

row["foo"].ToString().Equals(row["Bar"].ToString());