public Expression <Func <T, bool> > CreateDydaminWhereAndExpression <T>(T querymodel) where T : class
{
Expression <Func <T, bool> > finalexpression = PredicateExtensionses.True <T>();
if (querymodel == null)
{
return(finalexpression);
}
Type t = querymodel.GetType();
PropertyInfo[] properties = t.GetProperties();
foreach (PropertyInfo item in properties)
{
object value = item.GetValue(querymodel, null);
if (value != null)
{
Type valuetype = value.GetType();
if (valuetype != typeof(Int32) && valuetype != typeof(Int64))
{
if (valuetype == typeof(DateTime) && (DateTime)value != DateTime.Parse("1900/1/1 0:00:00") && (DateTime)value != default(DateTime))
{
DateTime startdate = DateTime.Parse(Convert.ToDateTime(value).ToShortDateString());
DateTime enddate = startdate.AddDays(1);
Expression <Func <T, bool> > startexpression = ExpressionOperator.CreateCompareExpression <T>(item.Name, startdate, "greaterthanorequal");
Expression <Func <T, bool> > endexpression = ExpressionOperator.CreateCompareExpression <T>(item.Name, enddate, "lessthan");
finalexpression = finalexpression.And <T>(startexpression).And <T>(endexpression);
}
if (valuetype != typeof(DateTime) && valuetype != typeof(Boolean))
{
Expression <Func <T, bool> > currentexpression = ExpressionOperator.CreateCompareExpression <T>(item.Name, value);
finalexpression = finalexpression.And <T>(currentexpression);
}
}
else
{
long convervalue = Convert.ToInt64(value);
if (convervalue != 0)
{
Expression <Func <T, bool> > currentexpression = ExpressionOperator.CreateCompareExpression <T>(item.Name, value);
finalexpression = finalexpression.And <T>(currentexpression);
}
}
}
}
return(finalexpression);
}
