[英]c# DynamicObject class dynamic properties from loop
So I've created a class that inherits DynamicObject 所以我创建了一个继承DynamicObject的类
public class MyDynamicObject : DynamicObject{
private Dictionary<string, object> Fields = new Dictionary<string, object>();
public override bool TryGetMember(GetMemberBinder binder, out object result)
{
return Fields.TryGetValue(binder.Name, out result);
}
public override bool TrySetMember(SetMemberBinder binder, object value)
{
Fields[binder.Name] = value;
return true;
}
}
And call this class here 并在这里叫这个班
public class Program
{
public static void Main()
{
dynamic person = new MyDynamicObject();
person.firstname = "Hello";
Console.WriteLine(person.firstname);
}
}
Of course this will work. 当然可以。 But I need to create properties from a string array like
但是我需要从像这样的字符串数组创建属性
string[] fields = new string[]{"taxid","newcol","addrs","gender"};
dynamic person = new MyDynamicObject();
foreach(var f in fields)
{
person.f = "hello";
}
So the output will be person.taxi, person.newcol, person.addrs, person.gender 因此输出将为person.taxi,person.newcol,person.addrs,person.gender
Is this possible? 这可能吗?
Expose the Fields
dictionary in some way, or (better) a method that allows one to explicitly set a property by name. 以某种方式或更好的方法公开
Fields
字典,该方法允许人们按名称显式设置属性。
Note that ExpandoObject
already does this, as it can be cast to IDictionary<string, object>
and then you 请注意,
ExpandoObject
已经执行了此操作,因为可以将其IDictionary<string, object>
为IDictionary<string, object>
,然后您可以
ExpandoObject eo = new ExpandoObject();
IDictionary<string, object> dict = eo;
dynamic d = eo;
dict["MyProperty"] = 42;
Console.WriteLine(d.MyProperty); // 42
If you can't just use ExpandoObject
itself, you can copy its approach. 如果不能只使用
ExpandoObject
本身,则可以复制其方法。
Okay so based on the suggestion of @Jon Hanna, I came up with a solution that fits my requirements. 好的,所以根据@Jon Hanna的建议,我想出了一个适合我要求的解决方案。 I created a new Add method which accept a name.
我创建了一个接受名称的新Add方法。 Below is the updated code I used.
以下是我使用的更新代码。
public class DynamicFormData : DynamicObject
{
private Dictionary<string, object> Fields = new Dictionary<string, object>();
public int Count { get { return Fields.Keys.Count; } }
public void Add(string name, string val = null)
{
if (!Fields.ContainsKey(name))
{
Fields.Add(name, val);
}
else
{
Fields[name] = val;
}
}
public override bool TryGetMember(GetMemberBinder binder, out object result)
{
if (Fields.ContainsKey(binder.Name))
{
result = Fields[binder.Name];
return true;
}
return base.TryGetMember(binder, out result);
}
public override bool TrySetMember(SetMemberBinder binder, object value)
{
if (!Fields.ContainsKey(binder.Name))
{
Fields.Add(binder.Name, value);
}
else
{
Fields[binder.Name] = value;
}
return true;
}
public override bool TryInvokeMember(InvokeMemberBinder binder, object[] args, out object result)
{
if (Fields.ContainsKey(binder.Name) &&
Fields[binder.Name] is Delegate)
{
Delegate del = Fields[binder.Name] as Delegate;
result = del.DynamicInvoke(args);
return true;
}
return base.TryInvokeMember(binder, args, out result);
}
}
Then I just call it like this. 然后我就这样称呼它。
string[] fields = new string[]{"taxid","newcol","addrs","gender"};
dynamic formData = new DynamicFormData();
foreach(string field in fields)
{
formData.Add(field, null);
}
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