2024 C# return index of object in a list

C# return index of object in a list

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WebJan 1, 2009 · var items = from x in myListBox.Items where otherListOfMyObjects.Any (y => y == x /*SEE NOTE*/) select x; foreach (item i in items) myListBox.SelectedItems.Add (i); … WebMar 31, 2024 · The SortedList.SetByIndex () method is used to set the value using the index. It replaces the existing value with a new value which is given in SetByIndex () method. Syntax void SortedList.SetByIndex (int index, object? value); Parameter (s) index: The index at which to set the value.

C# Return a List from a Class Library

WebFeb 24, 2012 · I'm not sure I understand completely, but it sounds like you could resolve this be creating an indexer on class B to return the item you want: public object this[int index] { get { return list[index]; } } change 'object' to whatever your class type actually is. You can then access the items as if class B was an array: object item = classB[5]; hand controlled lamps on rally cars

Work with List\ - Introduction to C# tutorial Microsoft Learn

WebFeb 1, 2024 · Parameter: index: It is the zero-based index of the element to get or set of type System.Int32. Return Value: This property returns the element at the specified index. Exception: This method will give ArgumentOutOfRangeException if the index is less than 0 or index is equal to or greater than Count. WebFeb 1, 2024 · Here index is the zero-based index of the value to get. Return Value: It returns the value at the specified index of the SortedList object. Exception: This method will throw ArgumentOutOfRangeException if the index is outside the range of valid indexes for the SortedList object. Below programs illustrate the use of above-discussed method: WebJun 14, 2024 · Well, lets look at how we can use C# return index of a object in a List. Create a simple Address Class. We will use a simple Address class to demostrate how … bus from christchurch to bournemouth

C# Getting the value at the specified index of a SortedList object

How do I get the index of an object from a LINQ query in …

WebMar 18, 2010 · Just commenting for future searchers that C#6 will allow myCars.Select((car, index) => new {car, index}).FirstOrDefault(myCondition)?.index; to return a null index when handling cases where there are no results after myCondition is applied. – WebJun 11, 2024 · IndexOf () uses the default EqualityComparer, so if you overload equality for your items you can control this. Otherwise you can use First () or Single () (from LINQ) … bus from christchurch to southamptonWebRemarks. The Predicate is a delegate to a method that returns true if the object passed to it matches the conditions defined in the delegate. The elements of the current List are individually passed to the Predicate delegate, moving forward in the List, starting with the first element and ending with the last element. bus from chudleigh to exeter

"WebOct 3, 2014 · Starting with C# 8.0 you can use Index and Range classes for accessing elements. They provides accessing from the end of sequence or just access a specific part of sequence: var lastElement = myList [^1]; // Using Index var fiveElements = myList [2..7]; // Using Range, note that 7 is exclusive. You can combine indexes and ranges together: " - C# return index of object in a list

C# return index of object in a list

c# - How Can I Get the Index of An Item in a ListBox?

WebJan 20, 2024 · C# List class provides methods and properties to create a list of objects (types). For example, the IndexOf method returns the first index of an item if found in … WebJun 17, 2024 · Based on your description, you want to return a list from a classlibrary. You could try the following code. public List getlist(string name) { List list = new List(); if(name== "Lights") { list = SupportedDeviceTypes; return list; } else { return list; } } I used console app to test it.

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WebOct 9, 2013 · 7. I'm not sure what exactly do You need, but if You want to get value of certain index in list C# You can just do this using square brackets syntax: … WebDec 26, 2024 · 1. C#——设计一个Windows应用程序，在该程序中定义一个学生类和班级类 2. C#——设计一个窗体程序，定义一个Teacher类，包含姓名和职称两个字段和一个输出自己信息的方法，并用ArrayList实现与对集合的增、删、插入和遍历功能。 3. Java实现一个学生类Student 4. . 定义一个学生类Student，包含三个属性姓名、年龄、性别，建立三个 …

WebMay 27, 2024 · Fish fish = NoahsArk.Where(f => f is Fish) .Cast() .OrderByDescending(f => f.Scales) .FirstOrDefault(); As it's easier to read than a single line, but that's personal preference. You definitely don't want to use an index to remove items as any index you could get would be indexing the input list as filtered by the Where which … WebMar 7, 2024 · The List enables you to reference individual items by index as well. You place the index between [and ] tokens following the list name. C# uses 0 for the first index. Add this code directly below the code you just added and try it: Console.WriteLine($"My name is {names[0]}"); Console.WriteLine($"I've added {names[2]} and {names[3]} to the ...

WebJun 11, 2024 · EDIT: If you're only using a List<> and you only need the index, then List.FindIndex is indeed the best approach. I'll leave this answer here for those who need anything different (e.g. on top of any IEnumerable<>).. Use the overload of Select which … WebApr 19, 2024 · Generally speaking, you're going to need a concrete type to make this work, like a Person object or an int value.. The reason this is the case is because your type must implement an .Equals() method. It won't work with object objects, because the .Equals method for object compares references, not values, and your comparison will always …

WebApr 2, 2024 · The IndexOf method finds an item in a List. The IndexOf method returns -1 if no items are located in the List. The following code snippet finds a string and returns the matched position of the item. int …

WebAn indexer allows an object to be indexed such as an array. When you define an indexer for a class, this class behaves similar to a virtual array. You can then access the instance of this class using the array access operator ([ ]). Syntax. A one dimensional indexer has the following syntax −. element-type this[int index] { // The get accessor. bus from chorley to leylandWebA Return to the Object introduces the reader to the historical and theoretical framework out of which an anthropology of art has emerged, and examines the conditions under which it has renewed interest. It also shows the reader what art 'does' as a social and cultural phenomenon, and how it can impact alternative ways of organising and managing ... bus from christchurch to nelson nzWebFeb 16, 2016 · Solution 1. To access the list item you can use the index as you're doing above. But to take the object value you have to cast the list object to OrderField and … hand controller skywatcher gtiWebThis post will discuss how to find the index of an element in a list in C#. The solution should either return the index of the first occurrence of the required element or -1 if it is not … bus from chudleigh to newton abbotWebIndexOf will only return the index of the first one it comes across. Well, since it's not actually a List, you could use myList.Select ( (person, index) => new { Person = person, Index = index }).FirstOrDefault (entry => entry.Person.Name == myName); but honestly, I'm not sure if that's necessary "better" than what you have (though it would ... bus from christchurch to wellingtonhttp://www.javashuo.com/article/p-htdapkvn-pb.html bus from christchurch to lymingtonWebJul 5, 2014 · i need to build a list in a function, then return it to a another list variable the problem is: inside the function the list is built properly but when i return it to the outer variable it seems like all the elements of the outer list are all similar to the last one added to it inside the function. what is the reason of this? this is my code: bus from cinderford to lydney