How to get/find an object by property value in a list in C#

How to get/find an object by property value in a list in C#

In C#, you can use LINQ to get/find an object in a list by a property value. Here's an example:

using System.Collections.Generic; using System.Linq; public class Person { public string Name { get; set; } public int Age { get; set; } } public class Example { public void FindPersonByName(List<Person> people, string name) { Person person = people.FirstOrDefault(p => p.Name == name); if (person != null) { // Do something with the person object } } }

In this example, the Person class has two properties: Name and Age. The Example class has a method called FindPersonByName that takes a List<Person> and a string representing the name of the person to find.

The method uses LINQ to query the list and find the first Person object with a Name property that matches the name parameter. If a matching Person object is found, it's stored in the person variable.

You can then use the person object to perform some action, such as displaying information about the person.

Note that if the list may contain multiple Person objects with the same Name property value, you can use the Where method instead of FirstOrDefault to get a collection of all matching Person objects. For example:

List<Person> matchingPeople = people.Where(p => p.Name == name).ToList();

This code creates a new list of Person objects called matchingPeople that contains all Person objects with a Name property that matches the name parameter.

Examples

  1. "C# find object in list by property value"

    • Code:
      YourClass foundObject = yourList.Find(item => item.PropertyName == targetValue);
    • Description: Uses the Find method of a List to locate an object based on a specific property value (PropertyName in this case).

  2. "C# LINQ find object by property value in a list"

    • Code:
      YourClass foundObject = yourList.FirstOrDefault(item => item.PropertyName == targetValue);
    • Description: Utilizes LINQ's FirstOrDefault method to find the first object in the list with a specified property value.

  3. "C# get object from list by property value with LINQ"

    • Code:
      YourClass foundObject = yourList.SingleOrDefault(item => item.PropertyName == targetValue);
    • Description: Uses LINQ's SingleOrDefault method to find the object with a specified property value, ensuring that there is only one match.

  4. "C# find object by property value using Where"

    • Code:
      YourClass foundObject = yourList.Where(item => item.PropertyName == targetValue).FirstOrDefault();
    • Description: Combines the Where method with FirstOrDefault to find the first object in the list with a specific property value.

  5. "C# search list for object with property value"

    • Code:
      YourClass foundObject = yourList.Find(item => Equals(item.PropertyName, targetValue));
    • Description: Utilizes the Find method with the Equals method to find an object with a specific property value, handling null values.

  6. "C# find object by property value case-insensitive"

    • Code:
      YourClass foundObject = yourList.Find(item => string.Equals(item.PropertyName, targetValue, StringComparison.OrdinalIgnoreCase));
    • Description: Uses string.Equals with StringComparison.OrdinalIgnoreCase for a case-insensitive comparison when searching for an object by property value.

  7. "C# get object from list by property value ignoring case"

    • Code:
      YourClass foundObject = yourList.FirstOrDefault(item => item.PropertyName.Equals(targetValue, StringComparison.OrdinalIgnoreCase));
    • Description: Utilizes LINQ's FirstOrDefault with StringComparison.OrdinalIgnoreCase for a case-insensitive comparison when finding an object by property value.

  8. "C# find object by property value in list with custom comparer"

    • Code:
      YourClass foundObject = yourList.Find(item => CustomComparer.Compare(item.PropertyName, targetValue) == 0);
    • Description: Implements a custom comparer (CustomComparer) and uses it with Find to search for an object based on a specific property value.

  9. "C# search list for object by property value using IndexOf"

    • Code:
      int index = yourList.FindIndex(item => item.PropertyName == targetValue); YourClass foundObject = index != -1 ? yourList[index] : null;
    • Description: Finds the index of the object in the list with a specific property value using FindIndex and then retrieves the object.

  10. "C# find object in list by property value with custom predicate"

    • Code:
      YourClass foundObject = yourList.Find(item => CustomPredicate(item.PropertyName, targetValue));
    • Description: Defines a custom predicate (CustomPredicate) and uses it with Find to locate an object based on a specific property value.

More Tags

spring-jms oracleapplications selectionchanged cloudflare sharepoint date-comparison linq-group mouseup appendchild sax

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