c# - Showing the intersection between two strings -

i trying find intersection between 2 strings. example, if string 1 my car bad, , string 2 my horse good, return my is. code:

  public static string intersection2(string x1, string x2) {   string[] string1 = x1.split(' '); string[] string2 = x2.split(' '); string[] m = string1.distinct();  string[] n = string2.distinct();   string test;  var results = m.intersect(n,stringcomparer.ordinalignorecase);  test = results.tostring();    return test;  } 

but error system.linq.enumerable+d__921[system.string]`. explain what's going on, , how can fix it?

you're not seeing error - seeing qualified name of type of result, system.linq.enumerable+d_921[system.string]. default behavior tostring(), unless overridden in inheriting class. see object.tostring().

to show results of intersection, can use string.join, this:

test = string.join(" ", results); 

which produce my is.

note code posted wouldn't compile:

string[] m = string1.distinct(); string[] n = string2.distinct(); 

the above lines generated cannot implicitly convert type 'system.collections.generic.ienumerable<string>' 'string[]'. adding .toarray() 1 way resolve this. full code below:

public static string intersection2(string x1, string x2) {      string[] string1 = x1.split(' ');     string[] string2 = x2.split(' ');     string[] m = string1.distinct().toarray();     string[] n = string2.distinct().toarray();     string test;     var results = m.intersect(n, stringcomparer.ordinalignorecase);     test = string.join(" ", results);     return test; }