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

斯科特张伯伦在his answer中说：

如果这些是非静态字段定义，则无法使用该字段像这样的初始化器，你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 }
        };
    }
}

另外还有静态字段

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

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

};

Answer 2

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 }
        };
    }
}

Answer 3

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" } }
};

Initialize Dictionary <string，list <string =“”>＆gt; </string，>

3 个答案: