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https://issues.apache.org/jira/browse/LOG4NET-28?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12564471#action_12564471
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Greg Peterson commented on LOG4NET-28:
--------------------------------------
The PatternLayout uses SystemInfo.NullText which returns a string "(null)" not
the null value. If you use a custom property and set it to null, you will not
have the parameter set to DBNull.
The PatternConverter.WriteObject(TextWriter writer, ILoggerRepository
repository, object value) calls repository.RendererMap.FindAndRender(value,
writer);
which in turn, sets the value to "(null)" because the object value is null.
if (obj == null)
{
writer.Write(SystemInfo.NullText);
}
else
{
.....
> AdoNetAppender does not support inserting NULL into columns
> -----------------------------------------------------------
>
> Key: LOG4NET-28
> URL: https://issues.apache.org/jira/browse/LOG4NET-28
> Project: Log4net
> Issue Type: Bug
> Components: Appenders
> Affects Versions: 1.2.9
> Reporter: Nicko Cadell
> Assignee: Nicko Cadell
> Priority: Minor
> Fix For: 1.2.10
>
>
> The AdoNetAppender does not support inserting NULL values into columns.
> If a column allows NULL values then the AdoNetAppender should allow NULL
> values to be inserted. For most value types this means using the DBNull value
> for the parameter. The AdoNetAppenderParameter should convert CLI null values
> into DBNull values before setting the parameter value.
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