我正在使用Mysql数据库开发WinForm应用程序,当我在MySql Workbench上运行数据库脚本时,会显示如下消息:
我点击“确定”后,会显示脚本内容:
在运行脚本并创建数据库后,当我在WinForm应用程序中进行第一次查询时,会出现以下异常:
这是来自Program.cs的代码。
![enter image description here](https://istack.dev59.com/q6Xr3.webp)
![enter image description here](https://istack.dev59.com/bAmy1.webp)
var permissions_in_db = db.Permissions
.Where(a => a.Name == s)
.Count();
无法控制 System.IO.InvalidDataException 错误 : "GZip 标头中的魔数不正确。请确保您正在传递 GZip 流。"
以下是追踪信息:
System.IO.InvalidDataException not be controlled
HResult = -2146233087
Message = The magic number in GZip header is not correct. Make sure you are passing a GZip stream.
Source = System
StackTrace :
in System.IO.Compression.GZipDecoder.ReadHeader ( InputBuffer input)
in System.IO.Compression.Inflater.Decode ( )
in System.IO.Compression.Inflater.Inflate ( Byte [ ] bytes , Int32 offset , Int32 length)
in System.IO.Compression.DeflateStream.Read ( Byte [ ] array , Int32 offset , Int32 count)
in System.IO.Compression.GZipStream.Read ( Byte [ ] array , Int32 offset , Int32 count)
in System.Xml.XmlTextReaderImpl.InitStreamInput ( baseUri Uri , String baseUriStr , Stream stream , Byte [ ] bytes , Int32 byteCount , Encoding encoding)
in System.Xml.XmlTextReaderImpl.FinishInitStream ( )
in System.Xml.XmlReaderSettings.CreateReader (Stream input , baseUri Uri , String baseUriString , XmlParserContext inputContext )
in System.Xml.XmlReader.Create (Stream input , XmlReaderSettings settings , String baseUri )
in System.Xml.Linq.XDocument.Load (Stream stream, LoadOptions options)
in System.Data.Entity.Migrations.Edm.ModelCompressor.Decompress ( Byte [ ] bytes )
in System.Data.Entity.Migrations.History.HistoryRepository.GetLastModel (String & migrationId )
in System.Data.Entity.Migrations.History.HistoryRepository.GetLastModel ( )
in System.Data.Entity.Internal.InternalContext.QueryForModel ( )
in System.Data.Entity.Internal.ModelCompatibilityChecker.CompatibleWithModel ( InternalContext internalContext , ModelHashCalculator modelHashCalculator , Boolean throwIfNoMetadata )
in System.Data.Entity.Internal.InternalContext.CompatibleWithModel (Boolean throwIfNoMetadata )
in System.Data.Entity.Database.CompatibleWithModel (Boolean throwIfNoMetadata )
in System.Data.Entity.DropCreateDatabaseIfModelChanges ` 1.InitializeDatabase ( tcontext context)
in System.Data.Entity.Database . < > c__DisplayClass2 ` 1. <SetInitializerInternal> b__0 ( DbContext c )
in System.Data.Entity.Internal.InternalContext . < > c__DisplayClass8 . <PerformDatabaseInitialization> b__6 ( )
in System.Data.Entity.Internal.InternalContext.PerformInitializationAction ( Action action)
in System.Data.Entity.Internal.InternalContext.PerformDatabaseInitialization ( )
in System.Data.Entity.Internal.LazyInternalContext . <InitializeDatabase> b__4 ( InternalContext c )
in System.Data.Entity.Internal.RetryAction ` 1.PerformAction ( TInput input)
in System.Data.Entity.Internal.LazyInternalContext.InitializeDatabaseAction ( Action ` 1 action )
in System.Data.Entity.Internal.LazyInternalContext.InitializeDatabase ( )
in System.Data.Entity.Internal.InternalContext.Initialize ( )
in System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType (Type entityType )
in System.Data.Entity.Internal.Linq.InternalSet 1.Initialize ` ( )
in System.Data.Entity.Internal.Linq.InternalSet 1.get_InternalContext ` ( )
in System.Data.Entity.Infrastructure.DbQuery 1.System.Linq.IQueryable.get_Provider ` ( )
in System.Linq.Queryable.Where [ TSource ] (IQueryable ` 1 source , Expression ` 1 predicate )
in RoleCreatorV5_net4.Login.button1_Click (Object sender, EventArgs e) in c: \ Users \ Rafa \ Downloads \ 1 \ final versions \ RoleCreatorV5_net4 \ Login.cs : line 30
in System.Windows.Forms.Button.OnMouseUp ( MouseEventArgs mevent )
at System.Windows.Forms.Control.WmMouseUp (Message & m , MouseButtons button , Int32 clicks)
at System.Windows.Forms.Control.WndProc (Message & m )
in System.Windows.Forms.ButtonBase.WndProc (Message & m )
in System.Windows.Forms.Button.WndProc (Message & m )
in System.Windows.Forms.NativeWindow.DebuggableCallback (IntPtr hWnd , Int32 msg , IntPtr wparam , IntPtr lparam )
in System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW (MSG & msg)
in System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID , Int32 reason , Int32 pvLoopData )
in System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner (Int32 reason , ApplicationContext context)
in System.Windows.Forms.Application.ThreadContext.RunMessageLoop (Int32 reason , ApplicationContext context)
in RoleCreatorV5_net4.Program.Main () in c: \ Users \ Rafa \ Downloads \ 1 \ final versions \ RoleCreatorV5_net4 \ Program.cs : line 70
in System.AppDomain._nExecuteAssembly ( RuntimeAssembly assembly, String [ ] args)
in System.Runtime.Hosting.ApplicationActivator.CreateInstance ( ActivationContext activationContext , String [ ] activationCustomData )
in Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssemblyDebugInZone ( )
in System.Threading.ExecutionContext.RunInternal ( ExecutionContext executionContext , ContextCallback callback , Object state , Boolean preserveSyncCtx )
at System.Threading.ExecutionContext.Run ( ExecutionContext executionContext , ContextCallback callback , Object state , Boolean preserveSyncCtx )
at System.Threading.ExecutionContext.Run ( ExecutionContext executionContext , ContextCallback callback , Object state )
in System.Threading.ThreadHelper.ThreadStart ( )
InnerException :
这是来自Program.cs的代码。
[STAThread]
static void Main()
{
Database.SetInitializer<MySqlContext>(new DropCreateDatabaseIfModelChanges<MySqlContext>());
var connString = ConfigurationManager.ConnectionStrings["ConnectionStringName"].ToString();
using (var db = new MySqlContext())
{
#region Load CheckedList1
const string f = "/Users/Rafa/Documents/Proyecto NS/SavedList.txt";
List<string> lines = new List<string>();
using (StreamReader r = new StreamReader(f))
{
string line;
while ((line = r.ReadLine()) != null)
{
lines.Add(line);
}
}
foreach (string s in lines)
{
var permissions_in_db = db.Permissions
.Where(a => a.Name == s)
.Count();
if (permissions_in_db < 1)
{
if (s!="")
{
db.Permissions.AddOrUpdate(new Permission
{
Name = s
});
db.SaveChanges();
}
}
}
#endregion
db.SaveChanges();
}
Application.EnableVisualStyles();
Application.SetCompatibleTextRenderingDefault(false);
Application.Run(new Login());
}
}
我真的希望有人能帮助我!
const string f = "/Downloads/SavedList.txt";
你的斜杠方向不对。 - merp\Downloads\SavedList.txt
,那么这甚至不是一个有效的路径。 - merp/Users/Rafa/Documents/Proyecto NS/SavedList.txt
不正确,你需要这样做@"C:\Users\Rafa\Documents\Proyecto NS\SavedList.txt"
。你是否调试过以查看你的lines
对象是否被填充? - merp