使用 C# 中的 ExpandoObject 在运行时使用数据动态创建具有动态子对象的对象

Question

我创建了一个动态对象并在运行时使用 ExpandoObject 为其设置属性和值

    dynamic parentDynamic = new ExpandoObject();

    var parentName = "GroupOne";
    ((IDictionary<String, Object>)parentDynamic)[parentName] = "default";

    Console.WriteLine(parentDynamic.GroupOne);

控制台按预期成功输出“默认”。

我还以相同的方式创建了一个具有多个属性的子对象

    dynamic childDynamic = new ExpandoObject();

    var childProperty1 = "FirstName";
    var childProperty2 = "LastName";
    var childProperty3 = "Occupation";

    ((IDictionary<String, Object>)childDynamic)[childProperty1] = "John";
    ((IDictionary<String, Object>)childDynamic)[childProperty2] = "Smith";
    ((IDictionary<String, Object>)childDynamic)[childProperty3] = "Plumber";

    Console.WriteLine(childDynamic.Occupation);

控制台按预期成功输出“Plumber”。

当我尝试将 childDynamic 对象添加到 parentDynamic 对象并在运行时为其命名时，我遇到了麻烦。这是我最近失败的尝试：

    var childName = "ChildOne";

    ((IDictionary<String, Object>)((IDictionary<String, Object>)parentDynamic)[parentName])[childName] = childDynamic;

    Console.Write(parentDynamic.GroupOne.ChildOne.Occupation);

我在尝试分配时遇到的错误是：无法将“System.String”类型的对象转换为“System.Collections.Generic.IDictionary`2[System.String,System.Object]” .

基本上我希望能够访问 parentDynamic.GroupOne.ChildOne.Occupation 并取回“管道工”或 parentDynamic.GroupOne.ChildOne.FirstName 并取回“约翰”

最初我想像这样一次性完成所有任务

 parentDynamic["GroupOne"]["ChildOne"]["Occupation"] = "Plumber"

但我得到错误 Cannot apply indexing with [] to an expression of type 'System.Dynamic.ExpandoObject' 这就是为什么我走上了创建父子对象和强制转换的道路首先将它们作为 Dictionary 对象。理想情况下，我想做类似上面的事情，因为它更简单。

Answer 1

为了能够使用parentDynamic.GroupOne.ChildOne 语法，GroupOne 属性也应该是动态的ExpandoObject，而在您的情况下它是string。

类似这样的：

dynamic parentDynamic = new ExpandoObject();
parentDynamic.GroupOne = new ExpandoObject();
parentDynamic.GroupOne.ChildOne = new ExpandoObject();
parentDynamic.GroupOne.ChildOne.FirstName = "John";
parentDynamic.GroupOne.ChildOne.LastName = "Smith";
parentDynamic.GroupOne.ChildOne.Occupation = "Plumber";

或使用IDictionary<string, object> 演员表：

IDictionary<string, object> parent = new ExpandoObject();
IDictionary<string, object> group = new ExpandoObject();
IDictionary<string, object> child = new ExpandoObject();
child["FirstName"] = "John";
child["LastName"] = "Smith";
child["Occupation"] = "Plumber";
parent["GroupOne"] = group;
group["ChildOne"] = child;
dynamic parentDynamic = parent;
Console.WriteLine(parentDynamic.GroupOne.ChildOne.Occupation);