C# Units PhotoCapture的SupportedResolutions为空

我正在使用Unity为全息透镜编程一个应用程序。在应用程序中，我需要一个按钮，它在单击时记录图像。为了拍照，我尝试使用Unitys PhotoCapture（如此处所述：或此处所述：）。 当我运行代码并单击按钮时，出现以下错误：System.invalidoOperationException:“序列不包含元素”关于以下行：cameraResolution=PhotoCapture.SupportedResolutions.OrderByDescending（（res）=>res.width*res.height）.First（）通过调试，我发现

SupportedResolutions

是空的。我怎样才能解决这个问题

代码的其余部分：

using System.Collections;
using System.Collections.Generic;
using System.Linq;

using UnityEngine;
using UnityEngine.XR.WSA.WebCam;
using UnityEngine.XR.WSA.Input;

using HoloToolkit.Unity.InputModule;

public class Record : MonoBehaviour, IInputClickHandler {

    PhotoCapture photoCaptureObject = null;
    Resolution cameraResolution;

    void Start () {}

    public void OnInputClicked(InputClickedEventData eventData)
    {
        cameraResolution = PhotoCapture.SupportedResolutions.OrderByDescending((res) => res.width * res.height).First();
        // Create a PhotoCapture object and so on
    }

---

（麦克风和网络摄像头在Unity中作为输入启用）

在尝试访问其分辨率之前，需要实例化photoCaptureObject

在尝试访问其分辨率之前，需要实例化photoCaptureObject

正如您所说，在填充PhotoCapture之前，需要调用

PhotoCapture.CreateAsync

您可以在下面获得代码示例和代码片段：

private void Start()
{
    PhotoCapture.CreateAsync(false, this.OnPhotoCreated);
}

// This method store the PhotoCapture object just created and retrieve the high quality
// available for the camera and then request to start capturing the photo with the
// given camera parameters.
private void OnPhotoCreated(PhotoCapture captureObject)
{    
    Resolution cameraResolution = PhotoCapture.SupportedResolutions.OrderByDescending((res) => res.width * res.height).First();

    CameraParameters c = new CameraParameters()
    {
        hologramOpacity = 0.0f,
        cameraResolutionWidth = cameraResolution.width,
        cameraResolutionHeight = cameraResolution.height,
        pixelFormat = CapturePixelFormat.BGRA32
    };

//    captureObject.StartPhotoModeAsync(c, this.OnPhotoModeStarted);
}

---

正如您所说，在填充PhotoCapture之前，需要调用

PhotoCapture.CreateAsync

您可以在下面获得代码示例和代码片段：

private void Start()
{
    PhotoCapture.CreateAsync(false, this.OnPhotoCreated);
}

// This method store the PhotoCapture object just created and retrieve the high quality
// available for the camera and then request to start capturing the photo with the
// given camera parameters.
private void OnPhotoCreated(PhotoCapture captureObject)
{    
    Resolution cameraResolution = PhotoCapture.SupportedResolutions.OrderByDescending((res) => res.width * res.height).First();

    CameraParameters c = new CameraParameters()
    {
        hologramOpacity = 0.0f,
        cameraResolutionWidth = cameraResolution.width,
        cameraResolutionHeight = cameraResolution.height,
        pixelFormat = CapturePixelFormat.BGRA32
    };

//    captureObject.StartPhotoModeAsync(c, this.OnPhotoModeStarted);
}