unable to access EventArgs e value to use in HandleRequest
题
I am just learning about events, delegates and subscribers. I've spent the last 2 days researching and wrapping my brain around it all. I am unable to access the information being passed in my EventArgs e value. I have a saved project that wants to be opened. The state of the necessary forms are deserialized into a dictionary. A loop is hit that raises the UnpackRequest passing the key/value with it.
ProjectManager.cs file:
public delegate void EventHandler<TArgs>(object sender, TArgs args) where TArgs : EventArgs;
public event EventHandler<UnpackEventArgs> UnpackRequest;
Then farther down:
ProjectManager.cs file:
//Raise a UnpackEvent //took out virtual
protected void RaiseUnpackRequest(string key, object value)
{
if (UnpackRequest != null) //something has been added to the list?
{
UnpackEventArgs e = new UnpackEventArgs(key, value);
UnpackRequest(this, e);
}
}
Then within the open method, after dictionary gets populated with states of each form:
ProjectManager.cs file:
foreach (var pair in dictPackState) {
string _key = pair.Key;
dictUnpackedState[_key] = dictPackState[_key];
RaiseUnpackRequest(pair.Key, pair.Value); //raises the event.
}
I have a class for the Event:
public class UnpackEventArgs : EventArgs
{
private string strKey;
private object objValue;
public UnpackEventArgs(string key, object value)
{
this.strKey = key;
this.objValue = value;
}
//Public property to read the key/value ..and get them out
public string Key
{
get { return strKey; }
}
public object Value
{
get { return objValue; }
}
}
I am still working on the code to add subscribers and how the project components get re-constituted in the individual forms. But the part I'm trying to work on now is in the MainForm.cs where I handle the Unpacked Request using the arguements getting passed. My e contains the key values and the key represents where to send the value (which is the form object).
private void HandleUnpackRequest(object sender, EventArgs e)
{
//reflection happens here. turn key into object
//why can't i get e.key ???
object holder = e; //holder = VBTools.UnpackEventArgs key... value...all info
//object goToUnpack = (e.key).GetType();
//goToUnpack.unpackState(e.value);
}
I think I included all the necessary parts to get any help?! THANKS!
解决方案
Change this:
private void HandleUnpackRequest(object sender, EventArgs e)
To this:
private void HandleUnpackRequest(object sender, UnpackEventArgs e)
Remember your event handler declaration:
public event EventHandler<UnpackEventArgs> UnpackRequest;