In this post, we will see how to add and read an appsettings.json file in a .NET Core Console Application.
We open Visual Studio and we create a Console Application (.NET Core) project called “TestJson“:
Now, we add a file called “Parameters.json”, where we will storage a connection string for a DB and two parameters called ValueABC and ValueDEF:
{
"Logging": {
"LogLevel": {
"Default": "Warning"
}
},
"ConnectionStrings": {
"DbConnection": "ExampleTestConnection"
},
"Parameter": {
"ValueABC": "TestValue_ABC",
"ValueDEF": "TestValue_DEF"
}
}
IMPORTANT: We have to set the file’s property “Copy to Output Directory” with the value: “Copy if newer”:
Now, in order to read the Parameters.json file, we have to add, using NuGet packages, three libraries:
Microsoft.Extensions.Configuration
Microsoft.Extensions.Configuration.FileExtensions
Microsoft.Extensions.Configuration.Json
Finally, we modify Program.cs in order to read the appsetting file:
using Microsoft.Extensions.Configuration;
using System;
using System.IO;
namespace TestJson
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Starting reading file .json");
Console.WriteLine($"ConnectioString: {GetDbConnection()}");
Console.WriteLine($"The parameters are: {GetParameters()}");
Console.ReadLine();
}
private static string GetDbConnection()
{
var builder = new ConfigurationBuilder()
.SetBasePath(Directory.GetCurrentDirectory())
.AddJsonFile("Parameters.json", optional: true, reloadOnChange: true);
string strConnection = builder.Build().GetConnectionString("DbConnection");
return strConnection;
}
private static string GetParameters()
{
var builder = new ConfigurationBuilder()
.SetBasePath(Directory.GetCurrentDirectory())
.AddJsonFile("Parameters.json", optional: true, reloadOnChange: true);
var val1 = builder.Build().GetSection("Parameter").GetSection("ValueABC").Value;
var val2 = builder.Build().GetSection("Parameter").GetSection("ValueDEF").Value;
return $"The values of parameters are: {val1} and {val2}";
}
}
}
If we run the application, this will be the result:
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.SetBasePath(Directory.GetCurrentDirectory()) – this is absolutely wrong
It is absolutely correct.
Have you imported Microsoft.Extensions.Configuration.Json?
Cheers
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see this web site and be up to date daily.
Many has posted their solution but they missed to say about the file property : We have to set the file’s property “Copy to Output Directory” with the value: “Copy if newer”.
Really thanks for your efforts. This is simple and understandable.
Thank you so much it helped.
So easy and useful. Thanks a lot
Thanks, this saved me hours of trying to find the answers. I saw other examples but they were wrong.