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是否可以在每个函数开始在Azure函数中运行之前运行代码?

azure-functions httprequest validation c#

user246392 · 技术社区 · 8 年前

目前,我在每个函数中手动执行一系列代码(例如验证查询/头参数以及验证用户):

[FunctionName( "functionname" )]
public static async Task<HttpResponseMessage> Run( [HttpTrigger( AuthorizationLevel.Anonymous, "post")]HttpRequestMessage req)
{

   // Step 1 - Validate input

   // Step 2 - Process request

}

HttpRequestMessage HttpResponseMessage BadRequest )基于验证结果?

1 回复 | 直到 8 年前

Sebastian Achatz 8 年前

FunctionFilters

从官方文件复制(并缩短)的样本:

public static class Functions
{
    [WorkItemValidator]
    public static void ProcessWorkItem(
        [QueueTrigger("test")] WorkItem workItem)
    {
        Console.WriteLine($"Processed work item {workItem.ID}");
    }
}

public class WorkItemValidatorAttribute : FunctionInvocationFilterAttribute
{
    public override Task OnExecutingAsync(
        FunctionExecutingContext executingContext, CancellationToken cancellationToken)
    {
        executingContext.Logger.LogInformation("WorkItemValidator executing...");

        var workItem = executingContext.Arguments.First().Value as WorkItem;
        string errorMessage = null;
        if (!TryValidateWorkItem(workItem, out errorMessage))
        {
            executingContext.Logger.LogError(errorMessage);
            throw new ValidationException(errorMessage);
        }

        return base.OnExecutingAsync(executingContext, cancellationToken);
    }

    private static bool TryValidateWorkItem(WorkItem workItem, out string errorMessage)
    {
        // your validation logic goes here...
    }
}

您可以在此处找到更多信息: https://github.com/Azure/azure-webjobs-sdk/wiki/Function-Filters