Initialize Dictionary <string,List <string >>

Question

我想知道如何声明/初始化字典？下面给出了错误.

Dictionary<string, List<string>> myD = new Dictionary<string, List<string>>()
{
  {"tab1", MyList }
};

List <string> MyList = new List<string>() { "1" };

错误是:字段初始值设定项不能引用非静态字段,方法或属性MyList.它不是字典前面或后面的List声明.

Answer 1

Dictionary<string, List<string>> myD = new Dictionary<string, List<string>>()
{
    {"tab1", new List<string> { "1" } },
    {"tab2", new List<string> { "1","2","3" } },
    {"tab3", new List<string> { "one","two" } }
};

Answer 2

正如斯科特张伯伦在答案中所说:

如果这些是非静态字段定义,则不能使用这样的字段初始值设定项,则必须将数据放在构造函数中.

class MyClass
{
    Dictionary<string, List<string>> myD;        
    List <string> MyList;

    public MyClass()
    {
        MyList = new List<string>() { "1" };
        myD = new Dictionary<string, List<string>>()
        {
          {"tab1", MyList }
        };
    }
}

另外对于静态场

private static List<string> MyList = new List<string>()
{    
   "1"
};

private static Dictionary<string, List<string>> myD = new Dictionary<string, List<string>>()
{
    {"tab1", MyList }

};

Answer 3

如果这些是非静态字段定义，则不能像这样使用字段初始值设定项，必须将数据放入构造函数中。

class MyClass
{
    Dictionary<string, List<string>> myD;        
    List <string> MyList;

    public MyClass()
    {
        MyList = new List<string>() { "1" };
        myD = new Dictionary<string, List<string>>()
        {
          {"tab1", MyList }
        };
    }
}