F12 Shows Your API Key: Proxy It 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.
Serve a Static Site From Blob Storage With 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.
Create Microsoft 365 Groups Without the Welcome Email Flood
Learn how to create Microsoft 365 groups programmatically with the Graph SDK in C# without sending a welcome email flood to every member.
Load SharePoint Taxonomy Fields Fast With FieldValuesForEdit
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
Batch Your CSOM Operations Instead of Looping One by One
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
Learn how to authenticate to Microsoft Graph in C# with ClientCertificateCredential, with working snippets for both the v4 SDK and the v5/v6 SDK.
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
Learn how to download multiple SharePoint files as a zip from C# code, using Graph batching to fetch them and streaming each to disk instead of into memory.
Web Api logging attribute
Learn how to move Web API logging out of every controller method and into one C# attribute built on IActionFilter, logging the controller and its parameters.
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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