ASP.NET Tutorial: How to Create Dynamic Error Based Log Information?

You can use these procedures to generate dynamic error-based log data in.NET and save it in a database table.
Make a database table for logs.

To save log data, first create a table in your database. This is an illustration of how the table could appear.

<span class="token keyword keyword-CREATE">CREATE</span> <span class="token keyword keyword-TABLE">TABLE</span> ErrorLogs <span class="token punctuation">(</span>
    LogId <span class="token keyword keyword-INT">INT</span> <span class="token keyword keyword-PRIMARY">PRIMARY</span> <span class="token keyword keyword-KEY">KEY</span> <span class="token keyword keyword-IDENTITY">IDENTITY</span><span class="token punctuation">,</span>
    LogDate <span class="token keyword keyword-DATETIME">DATETIME</span> <span class="token operator">NOT</span> <span class="token boolean">NULL</span><span class="token punctuation">,</span>
    LogLevel <span class="token keyword keyword-VARCHAR">VARCHAR</span><span class="token punctuation">(</span><span class="token number">50</span><span class="token punctuation">)</span> <span class="token operator">NOT</span> <span class="token boolean">NULL</span><span class="token punctuation">,</span>
    Message NVARCHAR<span class="token punctuation">(</span>MAX<span class="token punctuation">)</span> <span class="token operator">NOT</span> <span class="token boolean">NULL</span><span class="token punctuation">,</span>
    StackTrace NVARCHAR<span class="token punctuation">(</span>MAX<span class="token punctuation">)</span><span class="token punctuation">,</span>
    Source NVARCHAR<span class="token punctuation">(</span><span class="token number">255</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    UserId NVARCHAR<span class="token punctuation">(</span><span class="token number">50</span><span class="token punctuation">)</span><span class="token punctuation">,</span>
    AdditionalInfo NVARCHAR<span class="token punctuation">(</span>MAX<span class="token punctuation">)</span>
<span class="token punctuation">)</span><span class="token punctuation">;</span>

CREATE TABLE ErrorLogs (

LogId INT PRIMARY KEY IDENTITY,

LogDate DATETIME NOT NULL,

LogLevel VARCHAR(50) NOT NULL,

Message NVARCHAR(MAX) NOT NULL,

StackTrace NVARCHAR(MAX),

Source NVARCHAR(255),

UserId NVARCHAR(50),

AdditionalInfo NVARCHAR(MAX)

);

Create a Logging Class in .NET

Create a class to handle the logging of errors to the database. This class will include methods to log different levels of information (e.g., errors, warnings, info).

Log Errors in Your Application

You can now use this Logger class to log errors whenever they occur in your application.

Configuration (Optional)

Make sure you have a connection string in your Web.config or App.config file.

Customize as Needed

Log Levels: You can add more levels (e.g., Debug, Critical) as needed.
Additional Information: You can log any additional information that might be useful for troubleshooting.
Handling Logging Failures: Ensure that the logging mechanism itself doesn’t cause your application to fail. You might want to implement fallback logging to a file or another medium in case the database is unavailable.

This approach provides a structured way to log and track errors in your application.

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