C# 如何在DLLImport属性中动态更改程序集路径?
如何在if条件语句中更改DLLImport属性中的程序集路径? e、 g.我想这样做:C# 如何在DLLImport属性中动态更改程序集路径?,c#,c++,C#,C++,如何在if条件语句中更改DLLImport属性中的程序集路径? e、 g.我想这样做: string serverName = GetServerName(); if (serverName == "LIVE") { DLLImportString = "ABC.dll"; } else { DLLImportString = "EFG.dll"; } DllImport[DLLImportString] 无法设置在运行时计算的属性值 您可以使用diffDllImports定义两个方
string serverName = GetServerName();
if (serverName == "LIVE")
{
DLLImportString = "ABC.dll";
}
else
{
DLLImportString = "EFG.dll";
}
DllImport[DLLImportString]
无法设置在运行时计算的属性值 您可以使用diff
DllImports
定义两个方法,并在if语句中调用它们
DllImport["ABC.dll"]
public static extern void CallABCMethod();
DllImport["EFG.dll"]
public static extern void CallEFGMethod();
string serverName = GetServerName();
if (serverName == "LIVE")
{
CallABCMethod();
}
else
{
CallEFGMethod();
}
或者您可以尝试使用winapi LoadLibrary加载dll DynamicCaly
[DllImport("kernel32.dll", EntryPoint = "LoadLibrary")]
static extern int LoadLibrary([MarshalAs(UnmanagedType.LPStr)] string lpLibFileName);
[DllImport("kernel32.dll", EntryPoint = "GetProcAddress")]
static extern IntPtr GetProcAddress( int hModule,[MarshalAs(UnmanagedType.LPStr)] string lpProcName);
[DllImport("kernel32.dll", EntryPoint = "FreeLibrary")]
static extern bool FreeLibrary(int hModule);
创建适合dll中方法的委托
delegate void CallMethod();
然后试着用类似的东西
int hModule = LoadLibrary(path_to_your_dll); // you can build it dynamically
if (hModule == 0) return;
IntPtr intPtr = GetProcAddress(hModule, method_name);
CallMethod action = (CallMethod)Marshal.GetDelegateForFunctionPointer(intPtr, typeof(CallMethod));
action.Invoke();
可能您可以使用条件编译来区分您的构建? 如果您可以确定构建是针对服务器a的,例如使用/define serverA编译,那么您可以
#if serverA
DllImport["ABC.dll"]
#else
DllImport["EFG.dll"]
#endif
您需要通过LoadLibrary/GetProcAddress手动加载dll 我同样需要一个小型应用程序,并使用c++/cli 在c#中,它将类似于:
delegate int MyFunc(int arg1, [MarshalAs(UnmanagedType.LPStr)]String arg2);
public static void Main(String[] args)
{
IntPtr mydll = LoadLibrary("mydll.dll");
IntPtr procaddr = GetProcAddress(mydll, "Somfunction");
MyFunc myfunc = Marshal.GetDelegateForFunctionPointer(procaddr, typeof(MyFunc));
myfunc(1, "txt");
}
编辑:是完整的示例从数据库中检索路径,并且在项目生命周期内会多次更改。我不想每次都更改代码这是我一直在寻找的解决方案!谢谢:)