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=> Operator can be read as "goes to", meaning "Move", called lambda operator. In front of the symbol is declared variables (that is, you write a small c), followed by the expression (c.name == id && c.password == pwd).
The tag is used to separate the left side of the input variables on the right side of the body lambda lambda expressions. Lambda expressions and anonymous methods are similar to inline expressions, but more flexible; widespread use of Lambda expressions in LINQ query syntax to method of representation.
Lambda表达式 RelayCommand(() => this.AddPerson(), () => this.CanAddPerson());
It can be translated as RelayCommand (parameter a, the parameter b). A parameter :() => this.AddPerson () of Dimethyl :() => this.CanAddPerson (). () => This.AddPerson () means a method without parameters, return type this.AddPerson () and do not specify the return value will be automatically determined. Similarly () => this.CanAddPerson () method that returns a parameter without this.CanAddPerson ()
For example:
Func<int, int, int> Add = (x, y) => x + y;
Console.WriteLine(Add(2, 3)); // 5