c# - 使用LINQ将变量值用作字段

我有这个对象：public class MyObject{ public int Id { get; set; } public string FieldA { get; set; } public string FieldB { get; set; } public string FieldC { get; set; } public string FieldD { get; set; }}我有一个IList 这个对象：IList<MyObject> MyListObject = new List<MyObject>();我对此执行Linq查询：var result = (from p in MyListObject where p.FieldC == "Test" select p.FieldA);在这种情况下，我返回“ p.FieldA”，但有时我需要返回“ p.FieldB”。我想将字段名称（FieldA或FieldB）放在这样的变量中var myvar = "FieldB"var result = (from p in MyListObject where p.FieldC == "Test" select p.????);如何在Linq查询中使用myvar内容（FieldB）作为字段名称？谢谢， (adsbygoogle = window.adsbygoogle || []).push({}); 最佳答案 如果您的方法本身知道必须在FieldA和FieldB之间进行选择，则可以使用：var whatField = "FieldA";var result = (from p in MyListObject where p.FieldA == "Test" select (whatField == FieldA ? p.FieldA : p.FieldB));如果您有2个以上的选项，我会选择传递一个lambda。Func<MyObject, object> fieldGetter;// Option A, switchswitch (whatField) { case "FieldA": fieldGetter = o => o.FieldA; break; case "FieldB": fieldGetter = o => o.FieldB; break; // More options}// Option B using reflection:var t = typeof(MyObject);var prop = t.GetProperty(whatField);fieldGetter = o => prop.GetValue(o, null);// Linq then looks likevar result = (from p in MyListObject where p.FieldA == "Test" select fieldGetter(p));使用lambda的优点是，您可以拆分逻辑，拆分哪个字段以及如何查询。您甚至可以使其适用于不同类型：IEnumerable<T> Query<T>(IQueryable<MyObject> MyListObject, Func<MyObject, T> fieldGetter) { return result = (from p in MyListObject where p.FieldA == "Test" select fieldGetter(p));}// call using:var result = Query(MyListObject, o => o.FieldA); (adsbygoogle = window.adsbygoogle || []).push({});