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    <p>I don't think .NET allows you to <em>create</em> a type "T" where T is a type argument, <strong>which is yet to be specified</strong>. So, the array of <code>Type</code>(s) from input string array cannot be created. </p> <p>However, in the second part of your question, I read that you want to <em>identify</em> the method which has those types given as string. That task is solvable by iterating though the arguments, creating another array of strings describing the method arguments, and then comparing the resulting and input arrays, as follows:</p> <pre><code> class MyClass&lt;T&gt; { public void MyMethod(T a, List&lt;T&gt; b, List&lt;Tuple&lt;T, string&gt;&gt; c) { } } class Program { static void Main(string[] args) { //input. var typesAsStr = new string[] { "T", "List`1[T]", "List`1[Tuple`2[T, string]]" }; //type to find a method. Type testType = typeof(MyClass&lt;&gt;); //possibly iterate through methods instead? MethodInfo myMethodInfo = testType.GetMethod("MyMethod"); //get array of strings describing MyMethod's arguments. string[] paramTypes = myMethodInfo.GetParameters().Select(pi =&gt; TypeToString(pi.ParameterType)).ToArray(); //compare arrays of strings (can be improved). var index = -1; Console.WriteLine("Method found: {0}", typesAsStr.All(str =&gt; { index++; return index &lt; paramTypes.Length &amp;&amp; str == paramTypes[index]; })); Console.ReadLine(); } private static CSharpCodeProvider compiler = new CSharpCodeProvider(); private static string TypeToString(Type type) { if (type.IsGenericType) { return type.Name + "[" + string.Join(", ", type.GetGenericArguments().Select(ga =&gt; TypeToString(ga))) + "]"; } else if (type.IsGenericParameter) { return type.Name; } //next line gives "string" (lower case for System.String). //additional type name translations can be applied if output is not what we neeed. return compiler.GetTypeOutput(new CodeTypeReference(type)); } } </code></pre> <p>In the [console] output I see that your input string <strong>matches</strong> the function.</p> <p>BTW, a lot of optimizations can be applied to this code if you face the performance problems, such as efficient way of working with strings, releasing <code>CSharpCodeProvider</code> instance maybe, etc. But the code is enough to solve the given task as questioned.</p>
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    1. POCreate open constructed type from string
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    1. COThanks, I'll look at your answer in more details. As for the optimization part, I don't really care as it's just for tests to be run by the CI server.
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    2. CO"which is yet to be specified": indeed, if the type is defined by the class, it's easy to get using WarrenG's approach. If the type is defined by the method, then we end up with a circular issue.
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