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functions-bindings-blob-storage-usage-csharp.md

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azure-functions
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12/02/2021
glenga

In-process class library

An in-process class library is a compiled C# function runs in the same process as the Functions runtime.

Isolated process

An isolated process class library compiled C# function runs in a process isolated from the runtime. Isolated process is required to support C# functions running on .NET 5.0.

C# script

C# script is used primarily when creating C# functions in the Azure portal.

Choose a version to see usage details for the mode and version.

Extension 5.x and higher

The following parameter types are supported for all versions:

  • Stream
  • TextReader
  • string
  • Byte[]

The following parameter types are extension version-specific and require FileAccess.ReadWrite in your C# class library:

For examples using these types, see the GitHub repository for the extension. Learn more about these new types are different and how to migrate to them from the Azure.Storage.Blobs Migration Guide.

[!INCLUDE functions-bindings-blob-storage-attribute]

Extension 2.x and higher

The following parameter types are supported for all versions:

  • Stream
  • TextReader
  • string
  • Byte[]

The following parameter types are extension version-specific and require FileAccess.ReadWrite in your C# class library:

[!INCLUDE functions-bindings-blob-storage-attribute]

Extension 5.x and higher

Isolated process currently only supports binding to string parameters.

Extension 2.x and higher

Isolated process currently only supports binding to string parameters.

Extension 5.x and higher

The following parameter types are supported for all versions:

  • Stream
  • TextReader
  • string
  • Byte[]

The following parameter types require you to set inout for direction in the function.json file.

Extension 2.x and higher

The following parameter types are supported for all versions:

  • Stream
  • TextReader
  • string
  • Byte[]

The following parameter types are extension version-specific and require you to set inout for direction in the function.json file.

Binding to string, or Byte[] is only recommended when the blob size is small. This is recommended because the entire blob contents are loaded into memory. For most blobs, use a Stream or CloudBlockBlob type. For more information, see Concurrency and memory usage.

If you get an error message when trying to bind to one of the Storage SDK types, make sure that you have a reference to the correct Storage SDK version.