The OnConfiguring method provides a fall-back mechanism for configuring a DbContext in Entity Framework Core. In this section, Phil explains how this works, shows the scaffolded OnConfiguring method, and warns about possible side effects of using it in production code.
- [Instructor] You've already seen the OnConfiguring method,…as that is how our context is configured…when we scaffolded the classes…from the AdventureWorks database.…This is essentially a fallback configuration mechanism…for a DbContext instance that runs after construction…and if the DbContext was configured through the constructor,…IsConfigured is set to true.…Be careful when using OnConfiguring in production code,…'cause this can introduce unexpected results.…
Typically, your OnConfiguring code will point…to your development database or have some other settings…in there that you are testing with.…It is much better to use a design time DbContext factory…to set the configuration and we will cover that…in the next section.…Once again, here is the OnConfiguring method.…We talked about how it works, now I want to briefly mention…when to use it.…
It's great for testing and we've been using it…throughout this course.…Not so great for production, because if something…should happen with your dependency injection,…then you have a hard coded connection string.…
Author
Phil Japikse
Released
6/6/2018- Persisting data
- Tracking EntityState
- Configuring the DbContext
- Transactions across DbContexts
- Understanding the batching process
- Attaching and deleting detached entities
- Design time configuration
- Concurrency checking
- Using custom execution strategies
Skill Level Intermediate
Duration
Views
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Introduction
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Welcome38s
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1. Persisting Data: Part 1
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Tracking EntityState9m 47s
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Batching of updates5m 8s
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2. Persisting Data: Part 2
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Attach detached entities3m 17s
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Delete detached entities6m 20s
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Introduction to concurrency4m 29s
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Concurrency checking5m 40s
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Async saves33s
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3. DbContext Options and Configuration
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Configure the DbContext6m 38s
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The OnConfiguring method1m 56s
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Design time configuration4m 40s
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Connection resiliency5m 9s
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Custom execution strategies3m 57s
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Conclusion
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Thank you10s
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Video: The OnConfiguring method