C#•9mo ago

❔ Help with TargetInvocationException when creating trace switch

I have 3 files, appsettings.json, instrumenting.csproj and Program.cs. appsettings.json:

5 Replies

appsettings.json:

{
  "PacktSwitch": {
    "Level": "Info"
  }
}

{
  "PacktSwitch": {
    "Level": "Info"
  }
}

Instrumenting.csproj:

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net7.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.Extensions.Configuration" Version="7.0.0" />
    <PackageReference Include="Microsoft.Extensions.Configuration.Binder" Version="7.0.4" />
    <PackageReference Include="Microsoft.Extensions.Configuration.FileExtensions" Version="7.0.0" />
    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="7.0.0" />
  </ItemGroup>

    <ItemGroup>
        <Using Include="System.Console" Static="true" />
    </ItemGroup>

    <ItemGroup>
      <None Update="appsettings.json">
        <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
      </None>
    </ItemGroup>

</Project>

<Project Sdk="Microsoft.NET.Sdk">

  <PropertyGroup>
    <OutputType>Exe</OutputType>
    <TargetFramework>net7.0</TargetFramework>
    <ImplicitUsings>enable</ImplicitUsings>
    <Nullable>enable</Nullable>
  </PropertyGroup>

  <ItemGroup>
    <PackageReference Include="Microsoft.Extensions.Configuration" Version="7.0.0" />
    <PackageReference Include="Microsoft.Extensions.Configuration.Binder" Version="7.0.4" />
    <PackageReference Include="Microsoft.Extensions.Configuration.FileExtensions" Version="7.0.0" />
    <PackageReference Include="Microsoft.Extensions.Configuration.Json" Version="7.0.0" />
  </ItemGroup>

    <ItemGroup>
        <Using Include="System.Console" Static="true" />
    </ItemGroup>

    <ItemGroup>
      <None Update="appsettings.json">
        <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
      </None>
    </ItemGroup>

</Project>

Program.cs:

using System.Diagnostics;
using Microsoft.Extensions.Configuration;

string logPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory), "log.txt");

WriteLine($"Writing to: {logPath}");

TextWriterTraceListener logFile = new(File.CreateText(logPath));

Trace.Listeners.Add(logFile);

// text writer is buffered, so this option calls
// Flush() on all listeners after writing

Trace.AutoFlush = true;

Debug.WriteLine("Debug says, I am watching!");
Trace.WriteLine("Trace says, I am watching!");

WriteLine("Reading from appsettings.json in {0}",
    arg0: Directory.GetCurrentDirectory());

ConfigurationBuilder builder = new();

builder.SetBasePath(Directory.GetCurrentDirectory());

builder.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true);

IConfigurationRoot configuration = builder.Build();

TraceSwitch ts = new(
    displayName: "PacktSwitch",
    description: "This switch is set via a JSON config.");

configuration.GetSection("PacktSwitch").Bind(ts); // Exception happens here.

Trace.WriteLineIf(ts.TraceError, "Trace error");
Trace.WriteLineIf(ts.TraceWarning, "Trace warning");
Trace.WriteLineIf(ts.TraceInfo, "Trace information");
Trace.WriteLineIf(ts.TraceVerbose, "Trace verbose");

//int unitsInStock = 12;
//LogSourceDetails(unitsInStock > 10);

ReadLine();

using System.Diagnostics;
using Microsoft.Extensions.Configuration;

string logPath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory), "log.txt");

WriteLine($"Writing to: {logPath}");

TextWriterTraceListener logFile = new(File.CreateText(logPath));

Trace.Listeners.Add(logFile);

// text writer is buffered, so this option calls
// Flush() on all listeners after writing

Trace.AutoFlush = true;

Debug.WriteLine("Debug says, I am watching!");
Trace.WriteLine("Trace says, I am watching!");

WriteLine("Reading from appsettings.json in {0}",
    arg0: Directory.GetCurrentDirectory());

ConfigurationBuilder builder = new();

builder.SetBasePath(Directory.GetCurrentDirectory());

builder.AddJsonFile("appsettings.json", optional: true, reloadOnChange: true);

IConfigurationRoot configuration = builder.Build();

TraceSwitch ts = new(
    displayName: "PacktSwitch",
    description: "This switch is set via a JSON config.");

configuration.GetSection("PacktSwitch").Bind(ts); // Exception happens here.

Trace.WriteLineIf(ts.TraceError, "Trace error");
Trace.WriteLineIf(ts.TraceWarning, "Trace warning");
Trace.WriteLineIf(ts.TraceInfo, "Trace information");
Trace.WriteLineIf(ts.TraceVerbose, "Trace verbose");

//int unitsInStock = 12;
//LogSourceDetails(unitsInStock > 10);

ReadLine();

Unknown User•9mo ago

Message Not Public

Xantres•9mo ago

I appreciate your advice, but I am still learning, been following a book and am trying to create a foundation I can work on. If you could please just diagnose the code that is written so I can learn from that and be able to move forward, it would be much appreciated.

Unknown User•9mo ago

Message Not Public

Accord•9mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ Help with TargetInvocationException when creating trace switch