public override bool IsValid(object value)
{
if (cs == null)
{
cs = ConstructOperation(value);
}
if (cs != null)
{
return((bool)Convert.ChangeType(cs.ExecuteFunc(ParamType == null ? value : Convert.ChangeType(value, ParamType)), typeof(bool)));
}
else
{
return(base.IsValid(value));
}
}
private ChoCodeDomProvider ConstructOperation(object value)
{
if (_defaultValueCodeSnippet.IsNullOrEmpty())
{
return(null);
}
string[] namespaces = NameSpaces.IsNullOrWhiteSpace() ? null : NameSpaces.SplitNTrim(';');
int opi = this._defaultValueCodeSnippet.IndexOf("=>");
if (opi < 0)
{
return(null); // throw new Exception("No lambda operator =>");
}
string param = this._defaultValueCodeSnippet.Substring(0, opi).NTrim();
if (Language == ChoCodeProviderLanguage.VB)
{
if (!ChoCodeDomProvider.IsValidVBIdentifier(param))
{
throw new ApplicationException("Invalid VB identifier found.");
}
}
else
{
if (!ChoCodeDomProvider.IsValidCSharpIdentifier(param))
{
throw new ApplicationException("Invalid C# identifier found.");
}
}
string codeBlock = this._defaultValueCodeSnippet.Substring(opi + 2).NTrim();
if (!codeBlock.Contains(";") && !codeBlock.StartsWith("return"))
{
codeBlock = "return {0};".FormatString(codeBlock);
}
var cd = new ChoCodeDomProvider(new string[] { codeBlock }, namespaces, Language);
cd.BuildFunc(param, ParamType == null ? value.GetType() : ParamType);
return(cd);
}