首页 \ 问答 \ 如何通过NDC过滤?(How to filter by NDC?)

如何通过NDC过滤?(How to filter by NDC?)

在log4net中,我想按NDC的值过滤日志消息,如下所示:

  <filter type="log4net.Filter.PropertyFilter">
    <Key value="NDC" />
    <stringToMatch value="MyContext" />
  </filter>

不知何故上面的过滤器没有像我预期的那样工作。

如何为我的appender配置只匹配某个NDC的过滤器?


In log4net I want to filter log messages by the value of the NDC like this:

  <filter type="log4net.Filter.PropertyFilter">
    <Key value="NDC" />
    <stringToMatch value="MyContext" />
  </filter>

Somehow the above filter is not working like I expected.

How do I have to configure a filter for my appender that will only match a certain NDC?


原文:https://stackoverflow.com/questions/1674411
更新时间:2024-01-12 20:01

最满意答案

您可以使用sed的以下技巧:首先用制表符替换所有空格,然后替换一个空格。 这是一个例子:

echo "a b c d" | sed 's/ /:/g;s/:/ /'

第一个sed命令s/ /:/g用冒号替换全局(因此g)所有空格,第二个用空格替换第一个冒号。 这将字符串abcd转换为ab:c:d


You could use the following trick with sed: First replace all blanks with tabs, then replace exactly one. Here's an example for illustration:

echo "a b c d" | sed 's/ /:/g;s/:/ /'

The first sed command s/ /:/g replaces globally (hence the g) all blanks with colons, and the second replaces the first colon with a blank. This turns the string a b c d into a b:c:d.

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