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    <p>You can do this with a method that keeps checking for common base classes. I wrote up this, quickly, using the BaseClass feature of the Type class. You don't have to use an array, a list or other IEnumerable can work with small modifications to this. </p> <p>I tested it with:</p> <pre><code>static void Main(string[] args) { Console.WriteLine("Common Types: " + GetCommonBaseClass(new Type[] {typeof(OleDbCommand), typeof(OdbcCommand), typeof(SqlCommand)}).ToString()); } </code></pre> <p>And got the right answer of DbCommand. Here is my code.</p> <pre><code> static Type GetCommonBaseClass(Type[] types) { if (types.Length == 0) return (typeof(object)); else if (types.Length == 1) return (types[0]); // Copy the parameter so we can substitute base class types in the array without messing up the caller Type[] temp = new Type[types.Length]; for (int i = 0; i &lt; types.Length; i++) { temp[i] = types[i]; } bool checkPass = false; Type tested = null; while (!checkPass) { tested = temp[0]; checkPass = true; for (int i = 1; i &lt; temp.Length; i++) { if (tested.Equals(temp[i])) continue; else { // If the tested common basetype (current) is the indexed type's base type // then we can continue with the test by making the indexed type to be its base type if (tested.Equals(temp[i].BaseType)) { temp[i] = temp[i].BaseType; continue; } // If the tested type is the indexed type's base type, then we need to change all indexed types // before the current type (which are all identical) to be that base type and restart this loop else if (tested.BaseType.Equals(temp[i])) { for (int j = 0; j &lt;= i - 1; j++) { temp[j] = temp[j].BaseType; } checkPass = false; break; } // The indexed type and the tested type are not related // So make everything from index 0 up to and including the current indexed type to be their base type // because the common base type must be further back else { for (int j = 0; j &lt;= i; j++) { temp[j] = temp[j].BaseType; } checkPass = false; break; } } } // If execution has reached here and checkPass is true, we have found our common base type, // if checkPass is false, the process starts over with the modified types } // There's always at least object return tested; } </code></pre>
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