具有方法參數值或使用委託的c＃函數

Question

我在窗口窗體應用程序中有兩個按鈕單擊事件。

private void butProcess_1_Click(...) 
{ 
    /// below parameters are just sample. 
    Process_1(int_param1, decimal_param2, datetime_param3); 
} 

private void butProcess_2_Click(...) 
{ 
    /// below parameters are just sample. 
    Process_2(string_param1, guid_param2, byteArray_param3, bool_param4); 
} 

由於這些進程需要較長時間才能完成執行，我需要向用戶顯示進度條。
所以我修改了我的事件butProcess_1_Click。

private void butProcess_1_Click(...) 
{ 
    frmLoadingControl _frmLoadingControl = new frmLoadingControl();    
    _frmLoadingControl.Show(this); 

    BackgroundWorker _BackgroundWorker = new BackgroundWorker(); 
    _BackgroundWorker.DoWork += (s, args) => 
    { 
     this.Invoke(new MethodInvoker(() => this.Enabled = false)); 
     /// below parameters are just sample. 
     Process_1(int_param1, decimal_param2, datetime_param3); 
    }; 
    _BackgroundWorker.RunWorkerCompleted += (s, args) => 
    { 
     _frmLoadingControl.Close(); 
     this.Invoke(new MethodInvoker(() => this.Enabled = true)); 
    }; 

    _BackgroundWorker.RunWorkerAsync(); 

} 

一切工作correctly.But問題是butProcess_2_Click我需要從butProcess_1_Click複製所有代碼。 而我必須只更改一行來調用process_2（）。

Process_2(string_param1, guid_param2, byteArray_param3, bool_param4); 

我不想複製我的代碼。我想要做的就像下面。

public void GenericFunction(Function _FunctionCode) 
{ 
    frmLoadingControl _frmLoadingControl = new frmLoadingControl();    
    _frmLoadingControl.Show(this); 

    BackgroundWorker _BackgroundWorker = new BackgroundWorker(); 
    _BackgroundWorker.DoWork += (s, args) => 
    { 
     this.Invoke(new MethodInvoker(() => this.Enabled = false)); 
     /// below parameters are just sample. 
     //Process_1(int_param1, decimal_param2, datetime_param3); 
     //Process_2(string_param1, guid_param2, byteArray_param3, bool_param4); 
     Execute(_FunctionCode); 
    }; 
    _BackgroundWorker.RunWorkerCompleted += (s, args) => 
    { 
     _frmLoadingControl.Close(); 
     this.Invoke(new MethodInvoker(() => this.Enabled = true)); 
    }; 

    _BackgroundWorker.RunWorkerAsync(); 
} 

private void butProcess_1_Click(...) 
{ 
    /// below parameters are just sample. 
    //Process_1(int_param1, decimal_param2, datetime_param3); 
    GenericFunction(Process_1(int_param1, decimal_param2, datetime_param3)); 
} 

private void butProcess_2_Click(...) 
{ 
    /// below parameters are just sample. 
    //Process_2(string_param1, guid_param2, byteArray_param3, bool_param4); 
    GenericFunction(Process_2(string_param1, guid_param2, byteArray_param3, bool_param4)); 
} 

請讓我得到您的建議。

Answer 1

傳遞一個代表，像這樣：

// CHANGE HERE 
public void GenericFunction(Action action) 
{ 
    frmLoadingControl _frmLoadingControl = new frmLoadingControl();    
    _frmLoadingControl.Show(this); 

    BackgroundWorker _BackgroundWorker = new BackgroundWorker(); 
    _BackgroundWorker.DoWork += (s, args) => 
    { 
     this.Invoke(new MethodInvoker(() => this.Enabled = false)); 

     // CHANGE HERE 
     action(); 

     Execute(_FunctionCode); 
    }; 
    _BackgroundWorker.RunWorkerCompleted += (s, args) => 
    { 
     _frmLoadingControl.Close(); 
     this.Invoke(new MethodInvoker(() => this.Enabled = true)); 
    }; 

    _BackgroundWorker.RunWorkerAsync(); 
} 

private void butProcess_1_Click(...) 
{ 
    // CHANGE HERE 
    GenericFunction(() => Process_1(int_param1, decimal_param2, datetime_param3)); 
} 

不應該在該：_frmLoadingControl.Close();放於Invoke下一行？這是值得在一個WinForms的「片」，即「行爲」 ...

this.Invoke(new MethodInvoker(() => 
{ 
    _frmLoadingControl.Close(); 
    this.Enabled = true; 
})); 

Answer 2

您應該使用Action委託 - https://msdn.microsoft.com/en-us/library/018hxwa8(v=vs.110).aspx

後臺工作已經過時。相反，你應該使用異步方法。 - https://msdn.microsoft.com/en-us/library/hh191443.aspx