public static Expression StringConcat(this ExpressionWizardCharms charms, Expression[] strings)
{
var body = default(Expression);
switch (strings.Length)
{
case 1:
body = strings[0];
break;
case 2:
case 3:
case 4:
var types = new Type[strings.Length];
var arguments = new Expression[strings.Length];
for (int i = 0; i < strings.Length; i++)
{
types[i] = typeof(string);
arguments[i] = strings[i];
}
body = Expression.Call(
typeof(string).GetMethod(nameof(string.Concat), types),
arguments
);
break;
default:
body = Expression.Call(
typeof(string).GetMethod(nameof(string.Concat), new[] { typeof(string[]) }),
Expression.NewArrayInit(typeof(string), strings)
);
break;
}
return(body);
}
public static ConstantExpression Null(this ExpressionWizardCharms charms)
{
return(Expression.Constant(null, typeof(object)));
}