/// <summary>
 /// Validates that the parameter is assignable to <typeparamref name="TType" />. Otherwise, an <see cref="ArgumentException" /> is thrown.
 /// </summary>
 /// <typeparam name="TType">The type the parameter should be assignable to.</typeparam>
 /// <param name="validator">The <see cref="ParameterValidator{TParameter}" />.</param>
 /// <param name="exceptionMessage">The exception message.</param>
 /// <returns>The same instance of <see cref="ParameterValidator{TParameter}" />.</returns>
 /// <exception cref="ArgumentException">Thrown when the parameter is not assignable to <typeparamref name="TType" />.</exception>
 public static ParameterValidator <Type> IsAssignableTo <TType>(this ParameterValidator <Type> validator, string exceptionMessage)
 {
     return(validator.IsAssignableTo(typeof(TType), exceptionMessage));
 }
 /// <summary>
 /// Validates that the parameter is assignable to <typeparamref name="TType" />. Otherwise, an <see cref="ArgumentException" /> is thrown.
 /// </summary>
 /// <typeparam name="TType">The type the parameter should be assignable to.</typeparam>
 /// <param name="validator">The <see cref="ParameterValidator{TParameter}" />.</param>
 /// <returns>The same instance of <see cref="ParameterValidator{TParameter}" />.</returns>
 /// <exception cref="ArgumentException">Thrown when the parameter is not assignable to <typeparamref name="TType" />.</exception>
 public static ParameterValidator <Type> IsAssignableTo <TType>(this ParameterValidator <Type> validator)
 {
     return(validator.IsAssignableTo(typeof(TType)));
 }