Understanding logging

Logging is an essential tool for troubleshooting any application. It helps to identify and solve problems. Logging is enabled by default in the Blazor WebAssembly project templates provided by Microsoft. However, the only logging provider that is enabled is the Console provider.

IMPORTANT NOTE

The Console provider does not store the logs, it only displays them. If you need to retain your logs, you will need to use a different provider.

The following code sample does the following:

• Injects an ILogger<Counter> object into the page. It uses the fully qualified name of the class type as the log category. The log category is included with each log message that is created by that instance of ILogger.
• Calls LogInformation to log the indicated string at the Information log level.

The following code writes to the log each time the button is clicked:

Counter.razor

@page "/counter"
@inject ILogger...