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C# 元组

admin4年前 (2022-06-09)代码相关7746

元组较灵活，可以使用Tuple泛型创建，这里不多说。只介绍更方便的方式。
~~~ C#
//将元组赋给单独声明的变量
(string name, string gender, double age) = ("FXPLL1", "male", 25);
textBox1.Text = "sample1:" + name + " " + gender + " " + age;

//将元组赋给预声明的变量
string name2;
string gender2;
double age2;
(name2, gender2, age2) = ("FXPLL2", "male", 25);
textBox1.AppendText("\nsample2:" + name2 + " " + gender2 + " " + age2);

//将元组赋给单独声明的隐式类型的变量
(var name3, var gender3, var age3) = ("FXPLL3", "male", 25);
textBox1.AppendText("\nsample3:" + name3 + " " + gender3 + " " + age3);

//将元组赋给单独声明的隐式类型的变量，但只用了一个var
var (name4, gender4, age4) = ("FXPLL4", "male", 25);
textBox1.AppendText("\nsample4:" + name4 + " " + gender4 + " " + age4);

//声明具名元组，按名称访问元组项
(string name5, string gender5, double age5) personInfo = ("FXPLL5", "male", 25);
textBox1.AppendText("\nsample5" + " " + personInfo.name5 + " " + personInfo.gender5 + " " + personInfo.age5);

//声明包含具名元组项的元组，将其赋给隐式类型的变量，按名称访问元组项
var personInfo2 = (name6: "FXPLL6", gender6: "male", age6: 25);
textBox1.AppendText("\nsample6" + " " + personInfo2.name6 + " " + personInfo2.gender6 + " " + personInfo2.age6);

//将元组项未具名的元组赋给隐式类型的变量，通过项编号属性访问单独的元素
var personInfo3 = ("FXPLL7", "male", 25);
textBox1.AppendText($"\nsample7:{personInfo3.Item1} {personInfo3.Item2} {personInfo3.Item3}");

//将元组项具名的元组赋给隐式类型的变量，但仍然通过项编号的属性单独访问元素
var personInfo4 = (name8: "FXPLL8", gender8: "male", age8: 25);
textBox1.AppendText($"\nsample8:{personInfo4.Item1} {personInfo4.Item2} {personInfo4.Item3}");

//赋值时用下划线丢弃元组的一部分（弃元）
(string name9, _, double age9) = ("FXPLL9", "male", 25);

//通过变量和属性名推断元组项名称
string name10 = "FXPLL10";
string gender10 = "male";
double age10 = 25;
var personInfo5 = (name10, gender10, age10);
textBox1.AppendText($"\nsample10:{personInfo5.name10} {personInfo5.gender10} {personInfo5.age10}");
~~~