PatchOperation.Set cannot handle null values

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Describe the bug PatchOperation.Set throws ArgumentNullException when value is null.

To Reproduce await container.PatchItemAsync<T>(id, PartitionKey.None, new List<PatchOperation> { PatchOperation.Set<string>(“/name”, null) });

Expected behavior Value should be set to null.

Actual behavior

System.ArgumentNullException: Value cannot be null. (Parameter ‘value’) at Microsoft.Azure.Cosmos.PatchOperationCore`1…ctor(PatchOperationType operationType, String path, T value) at Microsoft.Azure.Cosmos.PatchOperation.Set[T](String path, T value)

Environment summary SDK Version: 3.23.0 OS Version (e.g. Windows, Linux, MacOSX) Windows 11

Additional context According to @sajeetharan (https://stackoverflow.com/a/70194090/22092), this seems to be a known issue but I couldn’t find any matching issue in github.

[ghost]

This works for me.

Instead of using null I just create a JProperty with the value null. And use that value.

private JToken NullValue { get { return new JProperty("nullValue", null).Value; } } And use it like this operations.Add(PatchOperation.Set("\customer", value ?? NullValue));

[yang-er]

Hi, I have a workaround as below which could resolve your problem:

await container.PatchItemAsync(id, PartitionKey.None, new List { PatchOperation.Set("/name", new MemoryStream(Encoding.UTF8.GetBytes("null"))) });

My thought is that here we shouldn’t add null checks for value.