当用到反射的程序部署时出现System.Data - System.Reflection.ReflectionTypeLoadException: Unable to load one or more

最新推荐文章于 2023-01-08 16:15:21 发布

萧萧西风

最新推荐文章于 2023-01-08 16:15:21 发布

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分类专栏： .Net 文章标签：反射

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本文介绍了解决.NET应用程序中因缺失DLL文件导致的加载失败问题。提供了两种处理方案：一种是遇到加载失败即终止程序；另一种是在加载失败时记录错误并继续执行。适用于需要遍历bin目录反射加载DLL的应用场景。

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出现这个错误是因为某些dll无法用LoadFrom加载造成的，一般情况下是环境中缺少这个dll。另外一种情况，当你是遍历bin来反射dll时，如果不影响业务，可以把那些加载不上的dll忽略掉（前提是忽略掉的dll不影响业务）。

下面的try catch的位置，一旦有一个dll加载不上，就直接抛出异常，程序不再往下进行

public static string path = AppDomain.CurrentDomain.BaseDirectory + "\\bin\\";

public Dictionary<string,string> GetActivityContainer()

{

Dictionary<string, string> dic = new Dictionary<string, string>();

string tempName = "";

try

{

string[] dicFileName = Directory.GetFileSystemEntries(path);

if (dicFileName != null)

{

List<string> assemblyList = new List<string>();

foreach (string name in dicFileName)

{

if (name.ToLower().IndexOf(".dll") == -1)

{

continue;

}

Assembly assembly = Assembly.LoadFrom(name);

Type[] ts = assembly.GetTypes();

List<string> classList = new List<string>();

foreach (Type t in ts)

{

if (t.GetInterfaces().Length == 0)

{

continue;

}

if ( t.GetInterfaces()[0] != typeof(IActivity))

{

continue;

}

var attrArr = t.GetCustomAttributes(typeof(ActiveAttribute), true);

if (attrArr.Length == 0)

{

continue;

}

ActiveAttribute attr = attrArr[0] as ActiveAttribute;

if (attr != null)

{

tempName = name.Substring(name.LastIndexOf("\\") + 1);

dic.Add(attr.Msg, tempName);

}

catch (Exception e)

{

Log4NetHelp.Log.Error(e.Message);

throw new Exception(e.Message);

}

return dic;

}

public static string path = AppDomain.CurrentDomain.BaseDirectory + "\\bin\\";

public Dictionary<string,string> GetActivityContainer()

{

Dictionary<string, string> dic = new Dictionary<string, string>();

string tempName = "";

try

{

string[] dicFileName = Directory.GetFileSystemEntries(path);

if (dicFileName != null)

{

List<string> assemblyList = new List<string>();

foreach (string name in dicFileName)

{

if (name.ToLower().IndexOf(".dll") == -1)

{

continue;

}

Assembly assembly = Assembly.LoadFrom(name);

Type[] ts = assembly.GetTypes();

List<string> classList = new List<string>();

foreach (Type t in ts)

{

if (t.GetInterfaces().Length == 0)

{

continue;

}

if ( t.GetInterfaces()[0] != typeof(IActivity))

{

continue;

}

var attrArr = t.GetCustomAttributes(typeof(ActiveAttribute), true);

if (attrArr.Length == 0)

{

continue;

}

ActiveAttribute attr = attrArr[0] as ActiveAttribute;

if (attr != null)

{

tempName = name.Substring(name.LastIndexOf("\\") + 1);

dic.Add(attr.Msg, tempName);

}

catch (Exception e)

{

Log4NetHelp.Log.Error(e.Message);

throw new Exception(e.Message);

}

return dic;

}

下面的try catch的位置则可以让程序忽略掉加载不上的dll继续执行

Dictionary<string, string> dic = new Dictionary<string, string>();

string tempName = "";

string[] dicFileName = Directory.GetFileSystemEntries(path);

if (dicFileName != null)

{

List<string> assemblyList = new List<string>();

foreach (string name in dicFileName)

{

try

{

if (name.ToLower().IndexOf(".dll") == -1)

{

continue;

}

Assembly assembly = Assembly.LoadFrom(name);

Type[] ts = assembly.GetTypes();

List<string> classList = new List<string>();

foreach (Type t in ts)

{

try

{

if (t.GetInterfaces().Length == 0)

{

continue;

}

if (t.GetInterfaces()[0] != typeof(IActivity))

{

continue;

}

var attrArr = t.GetCustomAttributes(typeof(ActiveAttribute), true);

if (attrArr.Length == 0)

{

continue;

}

ActiveAttribute attr = attrArr[0] as ActiveAttribute;

if (attr != null)

{

tempName = name.Substring(name.LastIndexOf("\\") + 1);

dic.Add(attr.Msg, tempName);

}

catch (Exception ex)

{

Log4NetHelp.Log.Error(ex.Message);

}

catch (Exception e)

{

Log4NetHelp.Log.Error(e.Message);

}

return dic;

}