Nlog: JsonLayout - escape "${value}"

[KennethWKZ]

Type (choose one):

• Bug

NLog version: 4.4.2

Platform: .Net 4.5

Current NLog config: API

        var fileTarget1 = new FileTarget
            {
                Name ="FileTargetName",
                Layout = logObject,
                //so'on.....
            };

        logObject= new JsonLayout
        {
            Attributes =
            {
                new JsonAttribute("timestamp", DateTime.Now.ToString("O")),
                new JsonAttribute("htmltbody", "<tbody>${summaryTable.rowData}</tbody>")
            },
            RenderEmptyObject = false,
            SuppressSpaces = true
        };

BUG case:

• What is the current result?
  NLog failed to assign JsonAttribute value with simple text "${simpletext}". Example of the JsonAttribute value: "{"html": "Client ${client.name}"}"

• What is the expected result?
  Expected NLog can assign value in JsonAttribute "Client ${client.name}" is normal text usage instead of automatic recognize as configuration syntax.

• Are there any work arrounds? yes/no
  No

• Is there a version in which it did worked?
  No

[304NotModified]

NLog failed to assign JsonAttribute value with simple text "${simpletext}". Example of the JsonAttribute value: "{"html": "Client ${client.name}"}"

Please show me how you doing this.

[KennethWKZ]

I using JsonLayout to customize my log.

``c# var fileTarget1 = new FileTarget { Name ="FileTargetName", Layout = logObject, //so'on..... };

`
logObject= new JsonLayout
{
Attributes =
{
new JsonAttribute("timestamp", DateTime.Now.ToString("O")),
new JsonAttribute("htmltbody", "${summaryTable.rowData}")
},
RenderEmptyObject = false,
SuppressSpaces = true
};
```

Which mean "${summaryTable.rowData}" actually it is not declare as a variable in NLog config (Configuration Syntax?) but I'm just want the value simply show exactly same word "${summaryTable.rowData}" in log.

Anyway can make NLog ignore it because it is same syntax way.

[304NotModified]

You could escape it with the ${literal}, see https://github.com/NLog/NLog/wiki/Literal-Layout-Renderer

[304NotModified]

That's we're you are looking for, right?

[KennethWKZ]

Yes! I didn't know got Literal Layout Renderer! It was solved my problem! Thank You!

[KennethWKZ]

Sorry...once test with this value with JsonAttribute decode way.
It will not work anymore and got this error message: LayoutRenderer cannot be found: 'test'.

Example of my JSON Serialized to string value:

var value = "{\"Headers\": {\"logname\": \"Test\"},\"dollarSign\": \"${test}\"}"

new JsonAttribute("body", "${literal:text=" + value + "}", false)

[304NotModified]

You need to escape only ${

There's a helper for that in c#, SimpleLayout.Escape(...)

[KennethWKZ]

my problem solved. Thanks again!!

[304NotModified]

👍