.NET 核心中 MySQL.Data 的“无法加载文件或程序集”问题答案

【问题标题】："Could not load file or assembly" problem with MySQL.Data in .NET core.NET 核心中 MySQL.Data 的“无法加载文件或程序集”问题
【发布时间】：2021-02-12 23:32:21
【问题描述】：

我正在使用 Visual Studio Code 并尝试使用 C# 为 GTA 5 RAGEMP 编写脚本，我对 C# 相当陌生，并且一切顺利，直到我尝试使用来自 oracle 的 MySQL.Data 创建 MySQL 连接器。在我的尝试中 - 抓住我得到这个：

System.IO.FileNotFoundException: 'Could not load file or assembly 'System.Drawing.Common, Version=4.0.2.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.'

                String SQLConnection = $"SERVER={sql.Host};PASSWORD={sql.Password};UID={sql.Username};DATABASE={sql.Database}";
                conn = new MySqlConnection(SQLConnection);

                try
                {
                    conn.Open();
                    NAPI.Util.ConsoleOutput("MySQL connection is up!");
                    IsConnectionSetUp = true;

                }
                catch(Exception ex)
                {
                    NAPI.Util.ConsoleOutput(ex.ToString());
                }

我在服务器控制台输出中得到了这个：

Could not load file or assembly 'System.Security.Permissions, Version=4.0.3.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.
Could not load file or assembly 'System.Drawing.Common, Version=4.0.2.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.
Could not load file or assembly 'System.Drawing.Common, Version=4.0.2.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.
Could not load file or assembly 'System.Drawing.Common, Version=4.0.2.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.
Could not load file or assembly 'System.Drawing.Common, Version=4.0.2.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.

这在 VSC 控制台输出中：

Exception thrown: 'System.IO.FileNotFoundException' in MySql.Data.dll
Exception thrown: 'System.IO.FileNotFoundException' in System.Private.CoreLib.dll
An exception of type 'System.IO.FileNotFoundException' occurred in System.Private.CoreLib.dll but was not handled in user code
Could not load file or assembly 'System.Drawing.Common, Version=4.0.2.0, Culture=neutral, PublicKeyToken=cc7b13ffcd2ddd51'. The system cannot find the file specified.

我将 MySQL/Connector 中的所有内容复制到我的运行时文件夹，我尝试使用 NuGet 下载 System.Drawing.Common 和 System.Security.Permissions，我尝试手动将 .DLL 添加到项目依赖项中，但没有任何效果。

【问题讨论】：

标签： c# mysql .net

【解决方案1】：

我猜 RAGEMP 嵌入了一些默认不包含这些程序集的 .NET 运行时版本。

尝试改用 nuget.org/packages/MySqlConnector。它还支持从 C# 连接到 MySQL，但依赖项更少。

【讨论】：