public static Expression GetCastExpression(Expression castexp, Expression argexp)
{
// take the value out of the var, if we've got a var
if (argexp.Type == typeof(InputVar))
{
argexp = Expression.Field(argexp, "Value");
}
string castname = (castexp as ConstantExpression).Value as string;
switch (castname.ToLower())
{
case "c:o":
return(Expression.Convert(argexp, typeof(object)));
case "c:b":
if (argexp.Type == typeof(string))
{
return(ExStrings.GetParseBoolExpression(argexp));
}
return(Expression.Convert(argexp, typeof(bool)));
case "c:b2":
return(Expression.Convert(argexp, typeof(bool[])));
case "c:d":
if (argexp.Type == typeof(string))
{
return(ExStrings.GetParseDoubleExpression(argexp));
}
return(Expression.Convert(argexp, typeof(double)));
case "c:d2":
return(Expression.Convert(argexp, typeof(double[])));
case "c:i":
if (argexp.Type == typeof(string))
{
return(ExStrings.GetParseIntExpression(argexp));
}
return(Expression.Convert(argexp, typeof(int)));
case "c:i2":
return(Expression.Convert(argexp, typeof(int[])));
case "c:s":
return(Expression.Call(typeof(ExCasts).GetTypeInfo().GetDeclaredMethod("ConvertToString"),
Expression.Convert(argexp, typeof(object))));
//return Expression.Convert(argexp, typeof(string));
case "c:s2":
return(Expression.Convert(argexp, typeof(string[])));
default:
// we didn't recognize the cast
throw new Exception("Unrecognized cast '" + castname + "'");
}
}
