如何对部分列值应用数据表排序

Question

I have a DataTable . and i want to apply sorting on a column using C# Sort function. but I have multiple value into column(with separator - Æ).

So i really want to apply sorting on a specific part of a column. It is possible or not.

For Example - My DataTable column is Tag . Column Tag have two value - TagId + TagName
Now i want to apply sort only on TagName .

How can i do ?

Example - My DataTable dt

Tag

10ÆAA -------->( TagId Æ TagName )

15ÆBB -------->( TagId Æ TagName )

0ÆCC -------->( TagId Æ TagName )

20ÆGG -------->( TagId Æ TagName )

In code -

dt.DefaultView.Sort = "Tag DESC"; // -- I try this this code but it apply sorting on whole column

I want result like this (sorted according TagName )

Tag

20ÆGG

0ÆCC

15ÆBB

10ÆAA

Not like this (not sorted according TagId )

Tag

0ÆCC

10ÆAA

15ÆBB

20ÆGG

Answer 1

Can you replace the Tag column with TagId and TagName columns? That would make your data structure make sense, and in turn make working with it (eg sorting) make sense. If not, I think this ought to work:

var ordered = dt.AsEnumerable().OrderByDescending(
 x => x.Field<string>("Tag").Substring(x.Field<string>("Tag").IndexOf("Æ") + 1));

Answer 2

If you have original columns in your datatable then you can use those columns for sorting.
Else you will have to loop through data-table each row and create a new data-table and use it for your code.