| description | title | ms.date | ms.assetid |
|---|---|---|---|
Learn more about: Trace Type Summary |
Trace Type Summary |
03/30/2017 |
e639410b-d1d1-479c-b78e-a4701d4e4085 |
Source Levels defines various trace levels: Critical, Error, Warning, Information, and Verbose, as well as provides a description of the ActivityTracing flag, which toggles the output of trace boundary and activity transfer events.
You can also review xref:System.Diagnostics.TraceEventType for the types of traces which can be emitted from xref:System.Diagnostics.
The following table lists the most important ones.
| Trace Type | Description |
|---|---|
| Critical | Fatal error or application crash. |
| Error | Recoverable error. |
| Warning | Informational message. |
| Information | Non-critical problem. |
| Verbose | Debugging trace. |
| Start | Starting of a logical unit of processing. |
| Suspend | Suspension of a logical unit of processing. |
| Resume | Resumption of a logical unit of processing. |
| Stop | Stopping of a logical unit of processing. |
| Transfer | Changing of correlation identity. |
An activity is defined as a combination of the trace types above.
The following is a regular expression that defines an ideal activity in a local (trace source) scope,
R = Start (Critical | Error | Warning | Information | Verbose | Transfer | (Transfer Suspend Transfer Resume) )* Stop
This means that an activity must satisfy the following conditions.
-
It must start and stop respectively by a Start and Stop traces
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It must have a Transfer trace immediately preceding a Suspend or Resume trace
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It must not have any traces between the Suspend and Resume traces if such traces exist
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It can have any and as many of critical/Error/Warning/Information/Verbose/Transfer traces as long as the previous conditions are observed
The following is a regular expression that defines an ideal activity in the global scope,
R+
with R being the regular expression for an activity in the local scope. This translates to,
[R+ = Start ( Critical | Error | Warning | Information | Verbose | Transfer | (Transfer Suspend Transfer Resume) )* Stop]+