如何访问列表类型的类的成员属性<class>

Question

目前我有以下Json，我将其转换为普通对象C#类。在我的普通对象类中，我将它们放在ModelMock类中，试图访问属性"name"one_answers"value"。但我无法访问，我得到并出错。我得到的错误："列表"不包含"名称"one_answers"值"的定义

这是供参考的Json：

{
"matchActionsReasons": [
{
"name": "False positive",
"value": -2147483648
},
{
"name": "Acceptable risk",
"value": -2147483647
},
{
"name": "Manager approval",
"value": -2147483646
}
]
}

这是我的模型类：

public class ModelMock
{
public static ModelMock SaveSettingsModel()
{
return new ModelMock
{
matchActionsReasons =new List<MatchActionsReason>
{    
name = "False positive",  **//Geting the error here**
value  = -2147483648      **//Geting the error here**
}
};
}
public class MatchActionsReason
{
public string name { get; set; }
public int value { get; set; }
}

public List<MatchActionsReason> matchActionsReasons { get; set; }
}

Answer 1

您必须创建和添加类型为MatchActionsReason:的对象

// Using a collection initializer for the list
// and object initializers for the items
matchActionsReasons = new List<MatchActionsReason>{    
new MatchActionsReason{ name = "False positive", value = -2147483648 }, 
new MatchActionsReason{ name = "Acceptable risk", value = -2147483647 }, 
new MatchActionsReason{ name = "Manager approval", value = -2147483646 }
};

或

// Using Add
matchActionsReasons = new List<MatchActionsReason>();
matchActionsReasons.Add(
new MatchActionsReason{ name = "False positive", value = -2147483648 }
);
matchActionsReasons.Add(
new MatchActionsReason{ name = "Acceptable risk", value = -2147483647 }
);  
matchActionsReasons.Add(
new MatchActionsReason{ name = "Manager approval", value = -2147483646 }
); 

List<T>类本身不具有name和value属性。除其他外，它具有Count特性。

您可以访问列表中元素的成员，如下所示：

string s = matchActionsReasons[1].name; // ==> "Acceptable risk"

或

MatchActionsReason mar = matchActionsReasons[1];
string s = mar.name; // ==> "Acceptable risk"

Answer 2

你必须这样写：

matchActionsReasons =new List<MatchActionsReason>
{    
new MatchActionReason
{
name = "False positive",
value  = -2147483648
},
add more instances here...          
}

所以完整的样本看起来是这样的：

public class ModelMock
{
public static ModelMock SaveSettingsModel()
{
return new ModelMock
{
matchActionsReasons =new List<MatchActionsReason>
{    
new MatchActionReason
{
name = "False positive",
value  = -2147483648
},
new MatchActionReason
{
name = "Another False One",
value  = -111111111
},
add more instances here...   
}
};
}
public class MatchActionsReason
{
public string name { get; set; }
public int value { get; set; }
}

public List<MatchActionsReason> matchActionsReasons { get; set; }
}

原因是当你做新的列表{把新的实例放在这里}

因此，您将要添加到列表中的实例放在括号之间。

这被称为集合初始值设定项。

这是Microsoft针对Obejct和Collection Initializers 的文档

Answer 3

您需要向列表中添加一个新的MatchActionsReason对象。如下图所示。

matchActionsReasons = new List<MatchActionsReason>();
matchActionsReasons.Add(new MatchActionsReason(){ name = "foo", value = 115 });