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Home Interviews What is the difference between self-hosting and IIS-hosting in WCF? – MindStick
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1 Answers

ICSM Computer
ICSM Computer 26 May 2025
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The main difference between self-hosting and IIS-hosting in WCF lies in who controls the service lifecycle and what protocols are supported. Here's a detailed comparison:

1. Hosting Control

Feature Self-Hosting IIS-Hosting
Service lifecycle Controlled by your application code (ServiceHost) Managed by IIS — automatic activation
Process management Your app must start and keep the service alive IIS handles process lifecycle
Manual setup required Yes (write code to open/close host) No (service activates on HTTP request)

2. Supported Protocols

Feature Self-Hosting IIS-Hosting
HTTP Yes Yes
TCP, Named Pipes, MSMQ Yes No (unless using WAS)
Flexibility High — supports all bindings Limited to HTTP (IIS 7+ supports WAS for others)

3. Deployment and Scalability

Feature Self-Hosting IIS-Hosting
Hosting environment Console app, Windows Service, WPF/WinForms IIS web server
Suitable for Lightweight apps, internal tools, testing Enterprise, production web services
Scalability Manual load balancing required Built-in scalability, process recycling

4. Security and Monitoring

Feature Self-Hosting IIS-Hosting
Built-in security Must be coded or configured manually IIS provides integrated authentication, SSL
Logging/Monitoring Manual setup or third-party tools Built-in IIS logging and monitoring

Example of Self-Hosting

ServiceHost host = new ServiceHost(typeof(MyService));
host.Open();
Console.WriteLine("Service is running...");
Console.ReadLine();
host.Close();

Summary

Aspect Self-Hosting IIS-Hosting
Startup Manual Automatic
Protocols All (HTTP, TCP, Pipes, MSMQ) Primarily HTTP (others via WAS)
Control Full control by developer Managed by IIS
Scalability Manual Built-in
Ideal For Testing, internal tools, non-HTTP services Web-based services requiring stability
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