Inserts Query, Command, CommandResult, QueryHandler, and CommandHandler classes for MediatR 5.x. Save with the extension .snippet instead of .xml.

CreateMediatRClasses.xml

<?xml version="1.0" encoding="utf-8"?>
<CodeSnippets
    xmlns="http://schemas.microsoft.com/VisualStudio/2005/CodeSnippet">
    <CodeSnippet Format="1.0.0">
        <Header>
            <Title>CreateMediatRClasses</Title>
            <Author>Jon Sagara</Author>
            <Description>Inserts Query, Command, and QueryHandler classes for MediatR</Description>
            <Shortcut>mediator</Shortcut>
        </Header>
        <Snippet>
            <Code Language="CSharp">
                <![CDATA[public class Query : IRequest<Command>
        { }

        public class Command : IRequest<CommandResult>
        { }

        public class CommandResult
        {
            public List<(string, string)> Errors { get; private set; } = [];
        }


        public class QueryHandler : IRequestHandler<Query, Command>
        {
            public QueryHandler()
            {

            }

            public async Task<Command> Handle(Query request, CancellationToken cancellationToken)
            {
                var command = new Command();

                await Task.CompletedTask;

                return command;
            }
        }

        public class CommandHandler : IRequestHandler<Command, CommandResult>
        {
            public CommandHandler()
            {

            }

            public async Task<CommandResult> Handle(Command request, CancellationToken cancellationToken)
            {
                var result = new CommandResult();

                await Task.CompletedTask;

                return result;
            }
        }]]>
            </Code>
        </Snippet>
    </CodeSnippet>
</CodeSnippets>

Updated to support changes in MediatR 4.0

Updated to support changes in MediatR 5.x