public ReportExpressionDefaultValueConstantAttribute(string field)
     : base(new ReportExpression(DefaultValueConstantAttribute.GetConstant(field) as string))
 {
 }
 public ReportExpressionDefaultValueConstantAttribute(Type type, string field)
     : base(ReportExpressionDefaultValueAttribute.CreateInstance(type, DefaultValueConstantAttribute.GetConstant(field)))
 {
 }