如何出口&导入功能并使用MEF执行它们? [英] How to export & import functions and execute them with MEF?
问题描述
//////////////////////// ////////////////////////////////////////////////// /////
MainApp:
[ImportMany(?)]
public IEnumerable< Lazy<?>> PluginFunctions1 {get;组; }
[ImportMany(?)]
public IEnumerable< Lazy<?>> PluginFunctions2 {get;组;
foreach(Flugin in PluginFunctions1)
{
f1(); //从每个插件执行Function1
}
foreach(PluginFunctions2中的f2)
{
string result = f2(val); //从每个插件执行Function2
}
//////////////////////////// ////////////////////////////////////////////////// /
插件:
[export(?)]
public void Function1()
{
}
[export(?)]
public string Function2(string value)
{
return result;
}
////////////////////////////////////// ////////////////////////
问题是我不知道如何定义import&导出以及如何正确执行该功能。
您可以将函数作为Func<或Action&取决于功能签名。对于第一个功能,您可以将其导入 IEnumerable< Lazy< Action>>
。第二个是 IEnumerable< Lazy&FunC< string,string>>>
。
希望包含一个合同名称来区分具有相同签名的不同功能。示例导出:
[Export(FunctionType)]
public string Function(string value)
{
返回值;
}
相应的导入:
[ImportMany(FunctionType)]
public IEnumerable< Lazy< Func< string,string>>> ImportedFunctions {get;组; }
I am creating an application that imports several plugins. I need the ability to execute functions that are implemented in each of the plugins. For example, I need to do something like this.
/////////////////////////////////////////////////////////////////////////////////
MainApp:
[ImportMany(?)]
public IEnumerable<Lazy<?>> PluginFunctions1 { get; set; }
[ImportMany(?)]
public IEnumerable<Lazy<?>> PluginFunctions2 { get; set; }
foreach (f1 in PluginFunctions1)
{
f1(); // execute Function1 from each plugin
}
foreach (f2 in PluginFunctions2)
{
string result = f2(val); // execute Function2 from each plugin
}
/////////////////////////////////////////////////////////////////////////////////
Plugin:
[export(?)]
public void Function1()
{
}
[export(?)]
public string Function2(string value)
{
return result;
}
/////////////////////////////////////////////////////////////////////////////////
Problem is that I am not sure how to define the import & export and how to exactly execute the function.
You can import the functions as a Func<> or Action<> delegate, depending on the function signature. For the first function you could import it into IEnumerable<Lazy<Action>>
. The second one would be IEnumerable<Lazy<Func<string, string>>>
.
You may want to include a contract name to differentiate between different functions with the same signature. A sample export:
[Export("FunctionType")]
public string Function(string value)
{
return value;
}
And a corresponding import:
[ImportMany("FunctionType")]
public IEnumerable<Lazy<Func<string, string>>> ImportedFunctions { get; set; }
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