refactor: close 方法增加返回值

Author: ArgoZhang

src/BootstrapBlazor/Services/MediaDevices/DefaultMediaDevices.cs

@@ -27,10 +27,10 @@ public async Task<bool> Open(MediaTrackConstraints constraints)
         return await module.InvokeAsync<bool>("open", constraints);
     }
 
-    public async Task Close(string? videoSelector)
+    public async Task<bool> Close(string? videoSelector)
     {
         var module = await LoadModule();
-        await module.InvokeVoidAsync("close", videoSelector);
+        return await module.InvokeAsync<bool>("close", videoSelector);
     }
 
     public async Task Capture()

src/BootstrapBlazor/Services/MediaDevices/DefaultVideoDevice.cs

@@ -27,7 +27,7 @@ public Task<bool> Open(MediaTrackConstraints constraints)
         return deviceService.Open(constraints);
     }
 
-    public Task Close(string? videoSelector)
+    public Task<bool> Close(string? videoSelector)
     {
         return deviceService.Close(videoSelector);
     }

src/BootstrapBlazor/Services/MediaDevices/IMediaDevices.cs

@@ -28,7 +28,7 @@ public interface IMediaDevices
     /// </summary>
     /// <param name="videoSelector"></param>
     /// <returns></returns>
-    Task Close(string? videoSelector);
+    Task<bool> Close(string? videoSelector);
 
     /// <summary>
     /// The capture() method of the MediaDevices interface captures a still image from the specified video stream and saves it to the specified location.

src/BootstrapBlazor/Services/MediaDevices/IVideoDevice.cs

@@ -28,7 +28,7 @@ public interface IVideoDevice
     /// </summary>
     /// <param name="videoSelector"></param>
     /// <returns></returns>
-    Task Close(string? videoSelector);
+    Task<bool> Close(string? videoSelector);
 
     /// <summary>
     /// Capture a still image from the video stream.

src/BootstrapBlazor/wwwroot/modules/media.js

@@ -51,21 +51,30 @@ export async function open(options) {
 }
 
 export async function close(videoSelector) {
-    if (videoSelector) {
-        const video = document.querySelector(videoSelector);
-        if (video) {
-            video.pause();
-            const stream = video.srcObject;
+    let ret = false;
+
+    try {
+        if (videoSelector) {
+            const video = document.querySelector(videoSelector);
+            if (video) {
+                video.pause();
+                const stream = video.srcObject;
+                closeStream(stream);
+                video.srcObject = null;
+            }
+        }
+        const media = registerBootstrapBlazorModule("MediaDevices");
+        const { stream } = media;
+        if (stream && stream.active) {
             closeStream(stream);
-            video.srcObject = null;
         }
+        media.stream = null;
+        ret = true;
     }
-    const media = registerBootstrapBlazorModule("MediaDevices");
-    const { stream } = media;
-    if (stream && stream.active) {
-        closeStream(stream);
+    catch (err) {
+        console.error("Error closing media devices.", err);
     }
-    media.stream = null;
+    return ret;
 }
 
 export async function getPreviewUrl() {