F12 Shows Your API Key: Hiding Third-Party Tokens Behind an Azure Function
Learn how to keep third-party API keys out of the browser by proxying SPFx web part calls through an Azure Function that swaps in the secret server-side.
C#
Everything on this blog written in C#: Microsoft Graph and CSOM client code, Azure Functions, reflection tricks, and the .NET side of Microsoft 365.
Every code sample on this blog is C#, so this topic is close to the full archive. It is here because a fair number of people arrive searching for the .NET side of a Microsoft 365 problem rather than the SharePoint side of it.
What you will find: client code against Microsoft Graph and CSOM, Azure Functions doing the background work, reflection and attributes doing the boring work, and a lot of async plumbing that exists purely because the API on the other end is slower than you would like.
What you will not find: framework tours or language feature walkthroughs. The C# here is in service of a problem I hit, which means the interesting part is usually the API behaviour, not the syntax.
Stop Re-Downloading Unchanged Blobs: Let Azure Answer 304 for You
Learn how to forward the browser's If-None-Match header to Azure Blob Storage with BlobRequestConditions, so unchanged files never leave storage at all.
One Endpoint, Whole Website: Serving a Static Site Through an Azure Function
Learn how a single Azure Function with a catch-all route can proxy an entire static website out of a private Blob Storage container, with auth in front of every file.
The SharePoint CSOM Performance Playbook: Stop Paying for Wasted API Calls
Learn how to speed up SharePoint CSOM with five proven techniques - batching, CAML joins, change detection, server-side exception handling, and fast taxonomy loading.
One Big PnP Template or Many Small Ones?
After testing with DevProxy, I found that monolithic PnP templates silently destroy your retry strategy. Here's what I learned.
SharePoint News Links via Graph SDK: Filling in the Gaps the Docs Left Behind
Learn how to create SharePoint News Link pages with a banner image using the Microsoft Graph Beta SDK in C# — including the multipart upload the official documentation leaves completely undocumented.
Stop Spamming Your Users: Create Microsoft 365 Groups Without Welcome Emails
Learn how to create Microsoft 365 groups programmatically with the Graph SDK in C# without sending a welcome email flood to every member.
CSOM Performance: Fast Taxonomy Loading for SharePoint List Items with Many Terms
An undocumented but effective approach to dramatically speed up CSOM taxonomy field loading when dealing with SharePoint list items that have many terms.
SharePoint CSOM: Prevent Unnecessary Updates and API Calls
The SharePoint API call that wasted resources is now optimized with smart change detection, reducing unnecessary updates and costs.
SharePoint's Server-Side Try-Catch: ExceptionHandlingScope
Discover how SharePoint's ExceptionHandlingScope can optimize your API calls, reduce costs, and enhance performance with server-side exception handling.
Optimize SharePoint Webhooks: Debouncing User Actions
Learn how to effectively debounce SharePoint webhooks to optimize performance and reduce unnecessary operations when users frequently click save.
Stop Retrying Everything: Smart Graph Batch Retry Logic
Learn smart retry logic for Microsoft Graph batching to optimize API calls, reduce throttling, and enhance user experience.
Graph Batching for File Content: Mapping Requests to Responses
How to handle Graph batching when downloading file content and mapping responses back to original requests
CSOM Performance Optimization: Why You Should Batch Your SharePoint Operations
Learn how to dramatically improve CSOM performance by batching operations instead of executing them one by one
DevProxy: How to Test API Rate Limiting and Throttling in C# Development
Discover how to simulate Microsoft Graph and SharePoint throttling locally using DevProxy, and prevent production slowdowns before they happen.
Efficient Multi-List Queries in CSOM: Using CAML Joins with CAMLEX
Learn how to efficiently query multiple SharePoint lists using CAML joins instead of multiple API calls to avoid throttling
Microsoft Graph SDK Authentication in C#: Quick Start Guide
Quick setup guide for Microsoft Graph SDK using your existing app registration
PnP.Framework Authentication in C#: A Beginner's Guide
Learn to authenticate C# applications with PnP.Framework and Azure using certificates in this beginner's guide to app registration and permissions.
Export files as zip from SharePoint
Download files from SharePoint as a zip, as is possible through the UI
Web Api logging attribute
Implement logging only with a attribute on each method in a controller
SQL save changes w. trigger
Easiest way to keep track of which changes have been made to an object, and likewise, who has carried out these changes.
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