我发现以下代码从自定义位置动态加载dll:
private void Form1_Load(object sender, EventArgs e)
{
AppDomain currentDomain = AppDomain.CurrentDomain;
currentDomain.AssemblyResolve += new ResolveEventHandler(MyResolveEventHandler);
}
private Assembly MyResolveEventHandler(object sender, ResolveEventArgs args)
{
string folderPath = Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location);
string assemblyPath = Path.Combine(folderPath, "libs", new AssemblyName(args.Name).Name + ".dll");
if (File.Exists(assemblyPath) == false) return null;
Assembly assembly = Assembly.LoadFrom(assemblyPath);
return assembly;
}
private void button1_Click(object sender, EventArgs e)
{
var zip = ZipFile.Read("test.zip");
foreach (ZipEntry file in zip)
{
file.Extract(".", ExtractExistingFileAction.OverwriteSilently);
}
}
在某些情况下,这个解决方案有效,但是我得到了ZipDotNet dll:
InnerException {"File or assembly name \"Ionic.Zip, Version=1.9.1.8, Culture=neutral, PublicKeyToken=edbe51ad942a3f5c\" or one of its dependencies, was not found. Operation is not supported. (Exception from HRESULT: 0x80131515)":"Ionic.Zip, Version=1.9.1.8, Culture=neutral, PublicKeyToken=edbe51ad942a3f5c"} System.Exception {System.IO.FileLoadException}
自从它传递if (File.Exists(assemblyPath) == false) return null;
后我猜测加载Ionic.Zip.dll的依赖关系有问题吗?我也将如何解决它们?
答案 0 :(得分:4)
查看Iconic.Zip.dll here的源代码,我看到项目中唯一的引用是System,System.Data,System.Security和System.Xml,所以我怀疑原因是您无法加载任何引用。
我认为你的程序集解析方法有点过于简单。假设程序集名称与文件名相同,但情况并非总是如此。因此,您可以为目标文件夹中的每个dll获取AssemblyName
并存储名称到文件的映射。然后,当解析器请求名称时,您可以使用已知名称查找它并加载程序集文件。这是一个快速实现的想法。
private Dictionary<string, string> assemblyNameToFileMapping = new Dictionary<string, string>();
private void Form1_Load(object sender, EventArgs e)
{
GetAssemblyNames();
AppDomain currentDomain = AppDomain.CurrentDomain;
currentDomain.AssemblyResolve += new ResolveEventHandler(MyResolveEventHandler);
}
private void GetAssemblyNames()
{
string folderPath = Path.Combine(Path.GetDirectoryName(Assembly.GetExecutingAssembly().Location), "libs");
foreach(string file in Directory.EnumerateFiles(folderPath, "*.dll"))
{
try
{
AssemblyName name = AssemblyName.GetAssemblyName(file);
assemblyNameToFileMapping.Add(name.FullName, file);
}
catch { } // Just move on if we can't get the name.
}
}
private Assembly MyResolveEventHandler(object sender, ResolveEventArgs args)
{
string file;
if (assemblyNameToFileMapping.TryGetValue(args.Name, out file))
{
return Assembly.LoadFrom(file);
}
return null;
}