C # Variable initialization problem: field initializers cannot reference non-static fields, methods, or properties

One on the code, after explaining

usingSystem;usingSystem.Collections.Generic;usingSystem.Linq;usingSystem.Text;namespaceteststatic{classProgram {Static voidMain (string[] args) {Console.WriteLine ("Resolve field initialization cannot reference non-static field issues"); A A=NewANewB ());  Console.WriteLine (A.restrs); //with the property call, you can resolve        }    }     Public classA { PublicA (B obj) { This. str =obj; Console.WriteLine (str.    Say2 ()); //The constructor can also be used to solve        }         PublicB Str {Get; Set; }        //string a = str.           Say2 (); //field initialization cannot reference non-static fields//Public String restrs = Restr ();//field initialization cannot reference non-static fields//and through the property call can be compiled through         Public stringRestrs {Get            {                returnrestr (); }            Set{restrs=value; }        }         Public stringrestr () {return "1 "can be solved by using the attribute call"; }    }     Public classB { PublicB () {} Public stringSay2 () {return "2 The use of constructors can also solve"; }    }}

Second, field initialization cannot refer to non-static fields because:

1 C # syntax rule: Uninitialized variables are not allowed in C #.

2 Property memory and variable memory are allocated at different times. Attributes are allocated at the time of use, while variables are allocated at the time of class initialization.

3 "When you instantiate a class, because the static field assignment is already done in the static constructor, the instantiated field is instantiated in a non-static constructor, and the time before and after the static constructor is executed earlier than the non-static constructor, and for this reason, there are two problems:

1, when you assign a value to a static field with a non-static field, the field is always empty error

2, when you assign a non-static value to a class: field initialization cannot reference a non-static field

Third, the solution:

1 "We can put the corresponding code in the constructor of the class that currently needs to be assigned because of the problem caused by the order problem during initialization.

2 uses the property's get to assign a value, as in the example above

C # Variable initialization problem: field initializers cannot reference non-static fields, methods, or properties