Check If Type of Primitive for .NET

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public static bool IsSimpleType(Type itemType) { var t = itemType; if (t.IsGenericType && t.GetGenericTypeDefinition().Equals(typeof(Nullable<>))) { t = Nullable.GetUnderlyingType(t); } switch (Type.GetTypeCode(t)) { case TypeCode.Int16: case TypeCode.Int32: case TypeCode.Int64: case TypeCode.UInt16: case TypeCode.UInt32: case TypeCode.UInt64: case TypeCode.SByte: case TypeCode.Single: case TypeCode.String: case TypeCode.DateTime: case TypeCode.Decimal: case TypeCode.Boolean: case TypeCode.Byte: case TypeCode.Char: case TypeCode.Double: return true; } return false; }

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<Extension()> _ Public Function IsSimpleType(ItemType As Type) As Boolean Dim t = ItemType If t.IsGenericType AndAlso t.GetGenericTypeDefinition().Equals(GetType(Nullable(Of ))) Then t = Nullable.GetUnderlyingType(t) End If Select Case Type.GetTypeCode(t) Case TypeCode.Int16, TypeCode.Int32, TypeCode.Int64, TypeCode.UInt16, TypeCode.UInt32, TypeCode.UInt64, _ TypeCode.[SByte], TypeCode.[Single], TypeCode.[String], TypeCode.DateTime, TypeCode.[Decimal], TypeCode.[Boolean], _ TypeCode.[Byte], TypeCode.[Char], TypeCode.[Double] Return True End Select Return False End Function