Question

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check whether a List<string> contains an element in another List<string> using LINQ

A SQL database column stores a bunch of strings like so: /String1/String2/String3/… with the first and last characters being ‘/’. I need to compare this column to a List<string> to decide whether a parameter string in the list is contained in the column value.

Column value: “/One/Two/Three/Four/”

Parameter: List<string> parameters = new List<string>{"Two", "Three"};

Compare the parameter list to the column value. Since at least one item appears in the column value, return true / select the row.

I’m using LINQ-to-SQL.

Answer 1

Use String.Split Method, Enumerable.Intersect Method and Enumerable.Any Method:

//I guess you can get the string representation of the column value
string value = "/One/Two/Three/Four/"; 
List<string> parameters = new List<string> { "Two", "Three" };

bool result = value.Split('/')
                   .Intersect(parameters)
                   .Any();