Introduction
在撰寫控制項時，我們常會需要依照不同的階段作不同的處理。像是在設計階段顯示與運行階段不同的畫面、關閉些在設計階段會造成錯誤的處理等等。這邊將對偵測目前所處階段的語法作些整理。
Detect Design-Time & Run-Time
若要在程式中分辨設計階段(Design-Time)與運行階段(Run-Time)，我們大致上有以下幾種方法。
WinForm
1.判斷Component.DesignMode Dim isDesignTime As Boolean = Component.DesignMode
2.判斷Site.DesignMode
Dim isDesignTime As Boolean = Me.Site IsNot Nothing AndAlso Me.Site.DesignMode
3.判斷當前處理序是否為Visual Studio
Dim isDesignTime As Boolean = Process.GetCurrentProcess().ProcessName.Equals(“devenv”, StringComparison.OrdinalIgnoreCase)
4.判斷LicenseUsageMode.UsageMode是否為LicenseUsageMode.Designtime
Dim isDesignTime As Boolean = System.ComponentModel.LicenseManager.UsageMode = System.ComponentModel.LicenseUsageMode.Designtime
5.判斷GetService(GetType(System.ComponentModel.Design.IDesignerHost))不為空
Dim isDesignTime As Boolean = GetService(GetType(System.ComponentModel.Design.IDesignerHost)) IsNot Nothing
ASP.NET
請參閱Detecting Designmode in ASP.Net
WPF
請參閱Detecting design time mode in WPF and Silverlight
Link
How Do I Detect Design-Time Vs Run-Time in a .NET Control?
Identifying the Run-Time and the Design Mode
Design Time Detection
Detect if Code is Running from the IDE
Detecting Design-time in C#
Windows Forms designer and DesignMode property issues
MSDN - Component.DesignMode Property
MSDN - IDesignerHost 介面