c# - 未捕获 System.Data.SQLite 的 FileNotFoundExceptions

Question

我在我的项目中使用 System.Data.SQLite。当输出文件夹中没有 System.Data.SQLite dll 时，我无法捕获 FileNotFoundException(其他异常捕获正常)。这是代码示例:

    private void button1_Click(object sender, RoutedEventArgs e)
    {
        try
        {
            SQLiteConnection conn = new SQLiteConnection();
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

MessageBox 没有显示。如果我在单独的函数中提取此代码并将此函数调用包装在 try catch 中，则捕获异常工作正常并且 MessageBox 显示:

    private void DeclareConnection()
    {
        SQLiteConnection conn = new SQLiteConnection();
    }

    private void button1_Click(object sender, RoutedEventArgs e)
    {
        try
        {
            DeclareConnection();
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.Message);
        }
    }

问题是什么？

Answer 1

您将不得不处理 AppDomain.AssemblyResolve事件，

订阅AssemblyResolve事件

AppDomain.CurrentDomain.AssemblyResolve += HandleAssemblyResolve;

这里是一些示例代码，用于处理 c# 中 x86/x64 SQLite 程序集的加载

    public static Assembly HandleAssemblyResolve(object sender, ResolveEventArgs args)
    {
        if (args.Name.Contains("System.Data.SQLite"))
        {
            if (_assembliesResolved)
                return null;

            Assembly returnValue;

            string executingAssemblyPath = Assembly.GetExecutingAssembly().Location;
            executingAssemblyPath = Path.GetDirectoryName(executingAssemblyPath);

            if (Environment.Is64BitProcess)
                executingAssemblyPath = Path.Combine(executingAssemblyPath, @"lib-sqlite\x64\", "System.Data.SQLite.dll");
            else //32 bit process
                executingAssemblyPath = Path.Combine(executingAssemblyPath, @"lib-sqlite\x86\", "System.Data.SQLite.dll");

            returnValue = Assembly.LoadFrom(executingAssemblyPath);

            _assembliesResolved = true;

            return returnValue;
        }

        return null;
    }