Using ELMAH in ASP.NET Core
March 20, 2016 by Anuraj
ASP.NET ELMAH ELM ASP.NET Core Logging
ELMAH (Error Logging Modules and Handlers) is an application-wide error logging facility that is completely pluggable. It can be dynamically added to a running ASP.NET web application, or even all ASP.NET web applications on a machine, without any need for re-compilation or re-deployment. ELMAH does not work with ASP.NET 5 because ELMAH (given its name) is based on ASP.NET 4.x’s Modules and Handlers (the ‘MAH’ of ‘ELMAH’). There is a prototype in ASP.NET 5 called ‘ELM’ (Error Logging Middleware) that has some features similar to ELMAH. This post is about using ELM in ASP.NET 5.
This post is about configuring ELMAH in ASP.NET Core.
- First you need to update project.json file and add reference of ELM.
{
"dependencies": {
"Microsoft.AspNet.Server.Kestrel": "1.0.0-rc1-final",
"Microsoft.AspNet.IISPlatformHandler": "1.0.0-rc1-final",
"Microsoft.AspNet.Diagnostics": "1.0.0-rc1-final",
"Microsoft.AspNet.Mvc": "6.0.0-rc1-final",
"Microsoft.AspNet.Diagnostics.Elm": "1.0.0-rc1-final"
},
"commands": {
"web": "Microsoft.AspNet.Server.Kestrel --server.urls http://*:5004"
},
"frameworks": {
"dnx451": { },
"dnxcore50": { }
}
}- Next you need to configure the Startup file ConfigureServices and Configure methods to support ELM.
public void ConfigureServices(IServiceCollection services)
{
services.AddElm();
services.ConfigureElm(options => {
options.Path = new PathString("/elm");
options.Filter = (name, level) => level >= LogLevel.Verbose;
});
services.AddMvc();
}
public void Configure(IApplicationBuilder app, ILoggerFactory loggerFactory)
{
app.Map("/HelloMVC6", map =>
{
app.UseElmPage();
app.UseElmCapture();
app.UseIISPlatformHandler();
app.UseDeveloperExceptionPage();
app.UseMvcWithDefaultRoute();
});
}Now if you browse http://localhost:5004/elm, you can see the logging information. Due to line break characters in style, the CSS is not working properly.
Happy Coding
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