Question

我正在上课

public class Person
{
    public string Name;
    public Dictionary<string, object> attr;
    public string state = "closed";
}

我想将数据添加到List

List<Person> mPer = new List<Person>();

mPer.Add(new Person() { data = "My tasks" },attr = new Dictionary<string, object>() {id= "1",title = "sdfsdf",description = "asdasdasd",rel = "Folder",parentID = DBNull.Value});

Answer 1

您应该将key和value分开，例如：

  attr = new Dictionary<string, object>() { { key, { value } };

在你的情况下：

 attr = new Dictionary<string, object>() { { "myKey", new { id = 2, ... } };

如果您想添加多个项目：

attr = new Dictionary<string, object>() {
        { "myKey", new {id = 2, title = "sdfsdf", description = "asdasdasd"} }, 
        { "myOtherKey", new {id = 3, title = "sdfsdsdf", description = "asdaasdasd" } }
        };

请注意花括号

Answer 2

如果您正在为词典属性寻找collection initializer：

  attr = new Dictionary<string, object> {
            { "id",  "1" },
            { "title", "sdfsdf" },
            { "description", "asdasdasd" },
            { "rel",  "Folder" },
            { "parentID", DBNull.Value }
         }

字典的整个集合初始化程序用大括号括起来。内括号包含将添加到Dictionary<string, object>的键/值对的初始值设定项。

我建议您阅读MSDN文章How to: Initialize a Dictionary with a Collection Initializer

完整代码应如下所示：

mPer.Add(new Person { 
           Name = "My tasks", // no braces here
           attr = new Dictionary<string, object> {
                { "id",  "1" },
                { "title", "sdfsdf" },
                { "description", "asdasdasd" },
                { "rel",  "Folder" },
                { "parentID", DBNull.Value }
           }
         });

如何声明具有数据成员字典类型的匿名类？

2 个答案: