Conditional Multiple Fields Searching and Filtering in LINQ

Question

Assuming that we have the following table:

Person:
  PersonID,
  Name,
  Age,
  Gender

And we are providing a search function that allows u

Answer 1

Try code like this

       string personName = txtPersonName.Text;
       int personAge = Convert.ToInt32(txtAge.Text);
       var opportunites =  from p in this.DataContext.Persons
                            select new
                            {
                                p.PersonID,
                                p.Name,
                                p.Age,
                                p.Gender
                            };

        if (personsID != 0)
            opportunites = opportunites.Where(p => p.PersonID == personID);

        if (personName != string.Empty)
            opportunites = opportunites.Where(p => p.Name.StartsWith(personName));

        if (personAge != 0)
            opportunites = opportunites.Where(p => p.Age == personAge);

This will work fine. If personName is not given it will be not add to where, and if given then it will added.