在ASP.NET C中使用Windcard的Datatable -Row过滤器

Question

I have datatable which has data as below now i need to fileter the rows based on column Role which contains the value 5:4 but when i filter through dataview rowfilter i am getting rows with values 75:4 also which is wrong below is the code i have tried , could anyone help me filter the particular value using dataview

datatabl;e looks like above

and below is c# code that i tried to filter

DataView dv1 = new DataView(dt);
                dv1.RowFilter = "Role like'%5:4%'";
                dt1 = dv1.ToTable();

Answer 1

Don't use RowFilter which is very limited and outdated but Linq-To-DataTable:

var matchingRows = from row in dt.AsEnumerable()
                   let roles = row.Field<string>("Role").Split('/')
                   where roles.Contains("5:4") 
                   select row;

This approach first splits the string by / and then searches in this array with Contains .

If you need to know if there was a matching row:

bool hasMatchingRows = matchingRows.Any();

if you want to create a new DataTable with those mathing rows:

if( hasMatchingRows )
{
    DataTable tblMatches = matchingRows.CopyToDataTable();
}

If you just want to know the initial-column of the matching.rows:

List<string> initials = matchingRows.Select(r => r.Field<string>("Initial")).ToList();

which contains only NML and GGRA in this example.

Answer 2

replace

dv1.RowFilter = "Role like'%5:4%'";

with

dv1.RowFilter = "Role like '5:4/%' OR Role like '%/5:4' OR Role = '5:4' OR Role like '%/5:4/%'";
//                             ^                   ^                ^                    ^
//                        startswith            endswith         equals              contains