generic-list

Imagine this struct : struct Person { public string FirstName { get; set; } public string LastName { get; set; } } And following code : var list = new List<Person>(); list.Add(new Person { FirstName = "F1", LastName = "L1" }); list.Add(new Person { FirstName = "F2", LastName = "L2" }); list.Add(new Person { FirstName = "F3", LastName = "L3" }); // Can't modify the expression because it's not a variable list[1].FirstName = "F22"; When I want to change Property 's value it gives me the following error: Can't modify the expression because it's not a variable While, when I tried to change it

First question on Stackoverflow (.Net 2.0): So I am trying to return an XML of a List with the following: public XmlDocument GetEntityXml() { StringWriter stringWriter = new StringWriter(); XmlDocument xmlDoc = new XmlDocument(); XmlTextWriter xmlWriter = new XmlTextWriter(stringWriter); XmlSerializer serializer = new XmlSerializer(typeof(List<T>)); List<T> parameters = GetAll(); serializer.Serialize(xmlWriter, parameters); string xmlResult = stringWriter.ToString(); xmlDoc.LoadXml(xmlResult); return xmlDoc; } Now this will be used for multiple Entities I have already defined. Say I would like

See the code sample below. I need the ArrayList to be a generic List. I don't want to use foreach . ArrayList arrayList = GetArrayListOfInts(); List<int> intList = new List<int>(); //Can this foreach be condensed into one line? foreach (int number in arrayList) { intList.Add(number); } return intList; Try the following var list = arrayList.Cast<int>().ToList(); This will only work though using the C# 3.5 compiler because it takes advantage of certain extension methods defined in the 3.5 framework. This is inefficient (it makes an intermediate array unnecessarily) but is concise and will work

I want to add a "Select One" option to a drop down list bound to a List<T> . Once I query for the List<T> , how do I add my initial Item , not part of the data source, as the FIRST element in that List<T> ? I have: // populate ti from data List<MyTypeItem> ti = MyTypeItem.GetTypeItems(); //create initial entry MyTypeItem initialItem = new MyTypeItem(); initialItem.TypeItem = "Select One"; initialItem.TypeItemID = 0; ti.Add(initialItem) <!-- want this at the TOP! // then DropDownList1.DataSource = ti; Use the Insert method: ti.Insert(0, initialItem); Update: a better idea, set the

I want my program to read from two text files into one List<T> . The List<T> is sorting and cleaning duplicates. I want the List<T> to save (after sorting and cleaning) to a txt file. But when I looked in the result txt file, I found this message: System.Collections.Generic.List`1[System.String] Does anyone have an idea how I could fix this error? Here is my code: using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.IO; namespace Uniqpass { class Program { static void Main(string[] args) { String pfad = "C:\\Dokumente und Einstellungen\\Bektas\

what is fastest way to remove duplicate values from a list. Assume List<long> longs = new List<long> { 1, 2, 3, 4, 3, 2, 5 }; So I am interesting in use lambda to remove duplicate and returned : {1, 2, 3, 4, 5} . What is your suggestion? The easiest way to get a new list would be: List<long> unique = longs.Distinct().ToList(); Is that good enough for you, or do you need to mutate the existing list? The latter is significantly more long-winded. Note that Distinct() isn't guaranteed to preserve the original order, but in the current implementation it will - and that's the most natural