C# Example of operation to obtain and set object attribute value through attribute name string

This article describes the operation of C# obtaining and setting object attribute value through attribute name strings. It is shared with you for your reference, as follows:

#Get object attribute value through reflection and set attribute value

0. Define a class

 public class User
 { 
  public int Id { get; set; }
  public string Name { get; set; }
  public string Age { get; set; }
 }

1. Obtain the object attribute value through the attribute name (string)

 User u = new User();
  = "lily";
 var propName = "Name";
 var propNameVal = ().GetProperty(propName).GetValue(u, null);
 
 (propNameVal);// "lily"

2. Set object attribute value through attribute name (string)

 User u = new User();
  = "lily";
 var propName = "Name";
 var newVal = "MeiMei";
 ().GetProperty(propName).SetValue(u, newVal);
 
 (propNameVal);// "MeiMei"

#Get all attribute names and types of objects

Implementation through class objects

 User u = new User();

 foreach (var item in ().GetProperties())
 {
  ($"propName:{},propType:{}");
 }
 // propName: Id,propType: Int32
 // propName:Name,propType: String
 // propName:Age,propType: String

Implemented by class

 foreach (var item in typeof(User).GetProperties())
 {
  ($"propName:{},propType:{}");
 }
 // propName: Id,propType: Int32
 // propName:Name,propType: String
 // propName:Age,propType: String

#Determine whether an object contains a certain attribute

 static void Main(string[] args)
 {
  User u = new User();
  bool isContain= ContainProperty(u,"Name");// true
 }


 public static bool ContainProperty( object instance, string propertyName)
 {
  if (instance != null && !(propertyName))
  {
   PropertyInfo _findedPropertyInfo = ().GetProperty(propertyName);
   return (_findedPropertyInfo != null);
  }
  return false;
 }

Encapsulate it as an extension method

 public static class ExtendLibrary
 {
  /// &lt;summary&gt;
  /// Use reflection to determine whether an object contains a certain attribute  /// &lt;/summary&gt;
  /// &lt;param name="instance"&gt;object&lt;/param&gt;
  /// <param name="propertyName">Properties that need to be judged</param>  /// <returns> Whether to include</returns>  public static bool ContainProperty(this object instance, string propertyName)
  {
   if (instance != null &amp;&amp; !(propertyName))
   {
    PropertyInfo _findedPropertyInfo = ().GetProperty(propertyName);
    return (_findedPropertyInfo != null);
   }
   return false;
  }
 }
 static void Main(string[] args)
 {
  User u = new User();
  bool isContain= ("Name");// true
 }

For more information about C# related content, please check out the topic of this site:C# data structure and algorithm tutorial》、《Summary of C# traversal algorithm and skills》、《Summary of C# array operation skills"and"Introduction to C# object-oriented programming tutorial》

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