循环中的c#DynamicObject类动态属性
所以我创建了一个继承DynamicObject的类循环中的c#DynamicObject类动态属性,c#,dynamicobject,C#,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) { retu
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;
}
}
这当然会奏效。但是我需要从字符串数组创建属性,比如
string[] fields = new string[]{"taxid","newcol","addrs","gender"};
dynamic person = new MyDynamicObject();
foreach(var f in fields)
{
person.f = "hello";
}
因此,输出将是person.taxi、person.newcol、person.addrs、person.gender
这是可能的吗?以某种方式公开
字段
字典,或者(更好的)一种允许按名称显式设置属性的方法
请注意,ExpandoObject
已经这样做了,因为它可以强制转换为IDictionary
,然后
ExpandoObject eo = new ExpandoObject();
IDictionary<string, object> dict = eo;
dynamic d = eo;
dict["MyProperty"] = 42;
Console.WriteLine(d.MyProperty); // 42
ExpandoObject eo=新的ExpandoObject();
词典dict=eo;
动态d=eo;
dict[“MyProperty”]=42;
Console.WriteLine(d.MyProperty);//42
如果你不能只用
ExpandoObject
本身,你可以复制它的方法。好吧,根据@Jon Hanna的建议,我想出了一个符合我要求的解决方案。我创建了一个新的Add方法,它接受一个名称。下面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);
}
}
看看内置的ExpandoObject;基本上,你必须公开一个向字典中添加字段的方法。我想你的问题可能会在第一个评论者说的时候得到回答,为什么不让字典这样做呢?person[f]=“hello”我已经使用ExpandoObject及其工作方式完成了,但我的要求是创建一个具有动态属性并可以实例化的类,我不知道这是否可能
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);
}
}
string[] fields = new string[]{"taxid","newcol","addrs","gender"};
dynamic formData = new DynamicFormData();
foreach(string field in fields)
{
formData.Add(field, null);
}