以前工作的asp.net webforms应用程序现在抛出这个错误:
系统。MissingMethodException:方法未找到
DoThis方法在同一个类上，它应该可以工作。
我有一个通用的处理程序，这样:
public class MyHandler: IHttpHandler
{
public void Processrequest(HttpContext context)
{
// throws error now System.MissingMethodException:
// Method not found.
this.DoThis();
}
public void DoThis(){ ... }
}
当前回答
当DLL的旧版本仍然在某个地方徘徊时，就会出现这个问题。确保部署了最新的程序集，并且某些文件夹中没有隐藏重复的旧程序集。最好的办法是删除所有构建的项目，然后重新构建/重新部署整个解决方案。
其他回答
也. .尝试“清理”您的项目或解决方案并重新构建!
在更新各种Nuget包后遇到这个错误。检查Visual Studio错误列表(或构建输出)，查看类似以下的警告:
发现同一依赖项的不同版本之间存在冲突 组装。在Visual Studio中，双击此警告(或选择它) 并按Enter)来修复冲突;否则，添加如下内容 绑定重定向到应用程序中的“运行时”节点 配置文件: .．.
在Visual Studio中双击此警告会自动调整我的web中的各种bindingRedirect包版本。配置并解决了错误。
我通过在服务器上安装正确的. net Framework版本解决了这个问题。该网站在4.0版本下运行，它调用的程序集是针对4.5编译的。在安装。net Framework 4.5并将网站升级到4.5之后，一切工作正常。
I had a similar scenario where I was getting this same exception being thrown. I had two projects in my web application solution, named, for sake of example, DAL and DAL.CustSpec. The DAL project had a method named Method1, but DAL.CustSpec did not. My main project had a reference to the DAL project and also a reference to another project named AnotherProj. My main project made a call to Method1. The AnotherProj project had a reference to the DAL.CustSpec project, and not the DAL project. The Build configuration had both the DAL and DAL.CustSpec projects configured to be built. After everything was built, my web application project had the AnotherProj and DAL assemblies in its Bin folder. However, when I ran the website, the Temporary ASP.NET folder for the website had the DAL.CustSpec assembly in its files and not the DAL assembly, for some reason. Of course, when I ran the part that called Method1, I received a "Method not found" error.
为了修复这个错误，我必须从DAL更改AnotherProj项目中的引用。CustSpec到只是DAL，删除了临时ASP中的所有文件。NET Files文件夹，然后重新运行网站。从那以后，一切都开始运转了。我还确保了DAL。在“生成配置”中取消选中CustSpec项目后，没有生成该项目。
我想我要分享这个，也许它能在未来帮助到其他人。
你试过把它关掉再打开吗?玩笑归玩笑，重启电脑才是真正让我成功的方法，其他答案中都没有提到。
