[英]Azure function HTTP trigger Blob storage output binding
I try to develop HTTP trigger azure function using C# and .net 3.0.1 (runtime ~3) and Visual Studio 2019. In my function I want to write data into blob and I want to be able set destination file name from request body. I try to develop HTTP trigger azure function using C# and .net 3.0.1 (runtime ~3) and Visual Studio 2019. In my function I want to write data into blob and I want to be able set destination file name from request body. I use the following code:
我使用以下代码:
public static async Task<IActionResult> Run(
[HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] HttpRequest req,
[Blob("reports/{reportname}", FileAccess.Write)] TextWriter report,
ILogger log)
{
But when I run function, I got error:但是当我运行 function 时,我得到了错误:
Unable to resolve binding parameter 'reportname'. Binding expressions must map to either a value provided by the trigger or a property of the value the trigger is bound to, or must be a system binding expression (e.g. sys.randguid, sys.utcnow, etc.).
I already read about bindings but I completely don't understand how to create correct binding or how to add binding into function.json file.我已经阅读了有关绑定的信息,但我完全不明白如何创建正确的绑定或如何将绑定添加到 function.json 文件中。
Can anyone please help/explain what do I do wrong?谁能帮助/解释我做错了什么?
Thanks!谢谢!
Firstly, you need to provide a value for {reportname}
as the error message says.首先,您需要为
{reportname}
提供一个值,如错误消息所述。
As you are using a [HttpTrigger]
, you can provide the value in a POST request body:当您使用
[HttpTrigger]
时,您可以在 POST 请求正文中提供值:
{
"reportName": "test"
}
In the [HttpTrigger]
binding, instead of getting a HttpRequest
object, you can get the binding to pass you a deserialized object to represent your POST request ie MyRequest
:在
[HttpTrigger]
绑定中,您可以获取绑定以向您传递反序列化的 object 来表示您的 POST 请求,即 MyRequest ,而不是获取HttpRequest
MyRequest
:
[HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = null)] MyRequest request
When you send a request, the ReportName
property will then get mapped in the [Blob]
binding to the path: reports/{reportname}
.当您发送请求时,
ReportName
属性将在[Blob]
绑定中映射到路径: reports/{reportname}
。 This is the path in blob storage where your file will be stored.这是存储文件的 blob 存储路径。
You can then use the output TextWriter report
parameter to add text to your blob:然后,您可以使用 output
TextWriter report
参数将文本添加到您的 blob:
report.WriteLineAsync("content");
Or you may wish to also send the report content in the POST body:或者您可能还希望在 POST 正文中发送报告内容:
public class MyRequest
{
public string ReportName { get; set; }
public string ReportContent { get; set; }
}
report.WriteLineAsync(request.ReportContent);
Full working example:完整的工作示例:
public static class HttpTriggeredFunction
{
[FunctionName("HttpTriggeredFunction")]
public static async Task<IActionResult> Run(
[HttpTrigger(AuthorizationLevel.Function, "get", "post", Route = "reports")] MyRequest request,
[Blob("reports/{reportname}", FileAccess.Write)] TextWriter report,
ILogger log)
{
await report.WriteLineAsync(request.ReportContent);
return new OkResult();
}
}
public class MyRequest
{
public string ReportName { get; set; }
public string ReportContent { get; set; }
}
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