Calling LinqPad 7 from Visual Studio C# Project

Question

I am trying to call LinqPad query from C#. Unfortunately, the code below does not work; the result is null as if nothing got returned by the script. I don't see any example of how to do this online. Any direction would be appreciated.

This is the LinqPad code for the query. It is saved as a C# Statement:

string Main(string message) { "testing".Dump(); return message.ToUpper(); }

This is the code in C# code in a Visual Studio Project Console Application that attempts to call the query:

using System; using LINQPad; namespace ConsoleAppLinqPad { internal class Program { static void Main(string[] args) { string pathToQuery = @"C:\Users\synct\OneDrive\Documents\LINQPad Queries\"; string script = "samplequery.linq"; var wholePath = pathToQuery + script; using (var query = Util.Compile(wholePath)) { var results = query.Run(QueryResultFormat.Text, "hello world").ReturnValueAsync.GetAwaiter(); while (!results.IsCompleted) ; var result = results.GetResult(); Console.WriteLine(result.Dump()); // prints "HELLO WORLD?" } Console.ReadKey(); } } }

I updated the original post. If there is a working sample I would love to see it. — Ivan
– Ivan, Commented Dec 13, 2021 at 19:42
Yes, but how is that different than what I am trying to do here? I don't reallly want to instantiate a process unless the above strategy doesn't work — Ivan
– Ivan, Commented Dec 13, 2021 at 20:34
The doc I linked to has all I know about it and more. I guess you could use Process.Start and redirect output but it seems a round-about way to execute a script. I suppose it is not practical to just put the code in a proper .NET application? — Crowcoder
– Crowcoder, Commented Dec 13, 2021 at 21:12

Matt · Accepted Answer · 2022-09-22 13:26:29Z

There is a LPRun7-x64.exe shipped with LinqPad (ARM64 and x86 versions are available as well) which allows to run LinqPad from a console. But you can also run it from a process.

With the example below you could run your samplequery.linq like:

string pathToQuery = @"C:\Users\synct\OneDrive\Documents\LINQPad Queries\"; string script = "samplequery.linq"; RunLpQuery(@$"{pathToQuery}{script}");

Example:

void Main() { RunLpQuery(@$"{AppPath}\Hello.linq"); } public string AppPath => #if LINQPAD System.IO.Path.GetDirectoryName(Util.CurrentQueryPath); #else System.IO.Path.GetDirectoryName(Assembly.GetAssembly(this.GetType()).Location); #endif // Linqpad 4+5: "LPRun.exe" // LinqPad 6: "LPRun6.exe" // Linqpad 7: "LPRun7-x64.exe" public const string LpRunName = "LPRun7-x64.exe"; object RunLpQuery(string query) #if LINQPAD => Util.Run(query, QueryResultFormat.Html).Dump(); #else => StartProcess(@$"{Util.LINQPadFolder}\{LpRunName}", AppPath, query); #endif bool StartProcess(string fileName, string workingDir, string arguments, bool hidden = false) { var p = new Process(); var args = p.StartInfo; if (hidden) { args.CreateNoWindow = true; args.UseShellExecute = false; // runs hidden } args.FileName = fileName; args.WorkingDirectory = workingDir; args.Arguments = arguments; var result = p.Start(); p.WaitForExit(); return result; }

Hello.linq:

void Main() { for (int i = 0; i < 5; i++) { "Hello World!".Dump(); Thread.Sleep(500); } }

Note that the example uses conditional compilation: Through #if LINQPAD statements it can run directly inside of LinqPad itself, showing the output of the called Hello example in the result windows, or outside in a Visual Studio project.

Details about the parameters for lprun can be found here. And if you just want to use LinqPad's extensions in the context of your VS project, then have a look there.

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