Filter a DataTable where the table does not contain items in List<string>

Question

I am having a few problems quering a DataSet.Tables[0] and removing rows that do not meet the critira of a List.

//This is my list
var values = new List<string> {"Test", "Test2"};

// Now I just query the DataSet for anything that doesnt match this list
var query = from x in ds.Tables[0].AsEnumerable()
            from b in values
            where !x.Field<string>("ColumnName").Contains(b)
            select x;

This works and returns the results but it is returning 2 x sets of the same rows (I assume because there is no join).

How can I just get Distinct values of these rows?

Answer 1

It sounds like you probably want:

var query = from x in ds.Tables[0].AsEnumerable()
            where !values.Any(b => x.Field<string>("ColumnName").Contains(b))
            select x;

In other words, find all the rows where the "ColumnName" field value isn't present in any of the values in values .

Answer 2

也许您正在寻找的是Distinct或Intersect方法而不是“.Contains”？

Answer 3

You don't have to join with your values list:

var query = from x in ds.Tables[0].AsEnumerable()
        where !values.Any(str => x.Field<string>("ColumnName").Contains(str))
        select x;