Dynamic splicing problems of GroupBy in C# and introduction to GroupBy usage

I won’t say much nonsense, I will just post the code to you. The specific code is as follows:

public class Person
{
 public string FirstName{set;get;}
 public string LastName{set;get;}
 public Person(){}
 public Person(string firstName, string lastName)
 {
 FirstName = firstName;
 LastName = lastName;
 }
}
List<Person> personList=new List<Person>();
(new Person() { FirstName = "Mickey", LastName = "Mouse" });
(new Person() { FirstName = "Mickey", LastName = "Mouse" });
(new Person() { FirstName = "zhang", LastName = "san" });
string columnName="FirstName";
var dics=(x => GetPropertyValue(x, columnName)).ToDictionary(x=>,x=>());
foreach(var dic in dics)
{
 (("{0},{1}\r\n",,));
}

ps: Let's take a look at the usage of GroupBy<> in C# List generic collection

//Get flowjump entity class based on subproject idflowJumps = ; 
//By process groupby flowjumpsIEnumerable&lt;IGrouping&lt;int, FlowJump&gt;&gt; query = 
(pet =&gt; , pet =&gt; pet); 
foreach (IGrouping&lt;int, FlowJump&gt; info in query) 
{ 
List&lt;FlowJump&gt; sl = &lt;FlowJump&gt;();// Grouped set//You can also loop to get grouped objects, which you can use to control//foreach (FlowJump set in info) 
//{ 
//} 
}

When using it, you need to use the keys in the group:

var groupInfo = (m => ).ToList(); 
   foreach (var item in groupInfo) 
   { 
    string infotemp = ; 
   }

Summarize

The above is the dynamic splicing problem of GroupBy in C# and the usage introduction of GroupBy<> that the editor introduced to you. I hope it will be helpful to you. If you have any questions, please leave me a message and the editor will reply to you in time. Thank you very much for your support for my website!