C#中的一个非常基本的反射示例的运行时错误
我正在尝试使用官方Microsoft docs 。具体来说,我正在尝试运行以下示例:
// Loads an assembly using its file name.
Assembly a = Assembly.LoadFrom("MyExe.exe");
// Gets the type names from the assembly.
Type[] types2 = a.GetTypes();
foreach (Type t in types2)
{
Console.WriteLine(t.FullName);
}
因此,我使用dotnet New Console -O = CustomConsole
制作了一个新的控制台应用。然后,我从项目文件中删除了隐式
(因为我不喜欢),并提出以下代码:
using System;
using System.Reflection;
namespace get_type_from_assembly
{
internal class Program
{
static void Main(string[] args)
{
// load assembly using full file name
Assembly a = Assembly.LoadFrom("C:\\Users\\bobmarley\\desktop\\temp\\csharp-reflection\\get-type-from-assembly\\bin\\Debug\\net6.0\\console-custom.exe");
// get type names from assembly
Type[] types2 = a.GetTypes();
foreach (Type t in types2)
{
Console.WriteLine(t.FullName);
}
}
}
}
然后我尝试使用dotnet run -projects运行生成的可执行文件= CustomConsole
。我有以下运行时错误:
Unhandled exception. System.BadImageFormatException: Bad IL format. The format of the file 'C:\Users\bobmarley\desktop\temp\csharp-reflection\get-type-from-assembly\bin\Debug\net6.0\console-custom.exe' is invalid.
at System.Runtime.Loader.AssemblyLoadContext.LoadFromPath(IntPtr ptrNativeAssemblyLoadContext, String ilPath, String niPath, ObjectHandleOnStack retAssembly)
at System.Runtime.Loader.AssemblyLoadContext.LoadFromAssemblyPath(String assemblyPath)
at System.Reflection.Assembly.LoadFrom(String assemblyFile)
at get_type_from_assembly.Program.Main(String[] args) in C:\Users\bobmarley\desktop\temp\csharp-reflection\get-type-from-assembly\Program.cs:line 11
make: *** [Makefile:5: run] Error 1
我不确定为什么会发生这种情况,因为我检查了,并且在指定的路径中确实存在可执行文件。这里发生了什么,我该如何解决?
I'm trying to learn a bit more about System.Reflection
using the official microsoft docs. Specifically I'm trying to run the following example:
// Loads an assembly using its file name.
Assembly a = Assembly.LoadFrom("MyExe.exe");
// Gets the type names from the assembly.
Type[] types2 = a.GetTypes();
foreach (Type t in types2)
{
Console.WriteLine(t.FullName);
}
So I made a new console app using dotnet new console -o=customconsole
. I then removed ImplicitUsings
from my project file (because I don't like that), and came up with the following code:
using System;
using System.Reflection;
namespace get_type_from_assembly
{
internal class Program
{
static void Main(string[] args)
{
// load assembly using full file name
Assembly a = Assembly.LoadFrom("C:\\Users\\bobmarley\\desktop\\temp\\csharp-reflection\\get-type-from-assembly\\bin\\Debug\\net6.0\\console-custom.exe");
// get type names from assembly
Type[] types2 = a.GetTypes();
foreach (Type t in types2)
{
Console.WriteLine(t.FullName);
}
}
}
}
Then I tried to run the generated executable using dotnet run --project=customconsole
. I got the following runtime error:
Unhandled exception. System.BadImageFormatException: Bad IL format. The format of the file 'C:\Users\bobmarley\desktop\temp\csharp-reflection\get-type-from-assembly\bin\Debug\net6.0\console-custom.exe' is invalid.
at System.Runtime.Loader.AssemblyLoadContext.LoadFromPath(IntPtr ptrNativeAssemblyLoadContext, String ilPath, String niPath, ObjectHandleOnStack retAssembly)
at System.Runtime.Loader.AssemblyLoadContext.LoadFromAssemblyPath(String assemblyPath)
at System.Reflection.Assembly.LoadFrom(String assemblyFile)
at get_type_from_assembly.Program.Main(String[] args) in C:\Users\bobmarley\desktop\temp\csharp-reflection\get-type-from-assembly\Program.cs:line 11
make: *** [Makefile:5: run] Error 1
I'm not sure why this occurs, because I checked and the executable does exist in the specified path. What is happening here and how can I fix it?
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一个可能的原因是,您的项目和加载的汇编目标是不同的平台,即x86 vs x64,这是我的经验,这是
badimageformatexception
的常见原因。另一个可能的原因是一个目标.NET核心,而另一个目标是.NET框架。动态加载组件将要求它与您的项目兼容。如果您想阅读任意组件,则可能需要一些工具,这些工具可以直接从CIL代码中提取您所关注的任何信息,而无需实际加载它。
A likely reason is that the your project and the loaded assembly target different platforms, i.e. x86 vs x64, In my experience that is a common reason for
BadImageFormatException
. Another possible reasons is that one targets .net core while the other targets .net framework.Dynamically loading an assembly will require that it is compatible with your project. If you want to read arbitrary assemblies you probably want some tool that can extract whatever information you are after from the CIL code directly, without actually loading it.