Essential C# LINQ Queries  Suggest an edit

Joining on multiple keys

PropertyInfo[] stringProps = typeof (string).GetProperties(); // string properties
PropertyInfo[] builderProps = typeof(StringBuilder).GetProperties(); // stringbuilder properties

var query =
    from s in stringProps
    join b in builderProps
        on new { s.Name, s.PropertyType } equals new { b.Name, b.PropertyType }
    select new
        StringToken = s.MetadataToken,
        StringBuilderToken = b.MetadataToken

Note that anonymous types in above join must contain same properties since objects are considered equal only if all their properties are equal. Otherwise query won’t compile.

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