refactor: 增加 SaveToFileAsync 扩展方法

Author: ArgoZhang

src/components/BootstrapBlazor.SummerNote/Extensions/EditorUploadFileExtensions.cs

@@ -0,0 +1,65 @@
+// Copyright (c) Argo Zhang (argo@163.com). All rights reserved.
+// Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
+// Website: https://www.blazor.zone or https://argozhang.github.io/
+
+namespace BootstrapBlazor.Components;
+
+/// <summary>
+/// EditorUploadFile 扩展方法类
+/// </summary>
+public static class EditorUploadFileExtensions
+{
+    /// <summary>
+    /// 保存到文件方法
+    /// </summary>
+    /// <param name="upload"></param>
+    /// <param name="fileName"></param>
+    /// <param name="bufferSize"></param>
+    /// <param name="token"></param>
+    /// <returns></returns>
+    public static async Task<bool> SaveToFileAsync(this EditorUploadFile upload, string fileName, int bufferSize = 64 * 1024, CancellationToken token = default)
+    {
+        var ret = false;
+
+        // 文件保护，如果文件存在则先删除
+        if (File.Exists(fileName))
+        {
+            try
+            {
+                File.Delete(fileName);
+            }
+            catch (Exception ex)
+            {
+                upload.Error = ex;
+                return ret;
+            }
+        }
+
+        var folder = Path.GetDirectoryName(fileName);
+        if (!string.IsNullOrEmpty(folder) && !Directory.Exists(folder))
+        {
+            Directory.CreateDirectory(folder);
+        }
+
+        using var uploadFile = File.OpenWrite(fileName);
+        try
+        {
+            // 打开文件流
+            var buffer = new byte[bufferSize];
+            int bytesRead = 0;
+
+            // 开始读取文件
+            while ((bytesRead = await upload.Stream.ReadAsync(buffer, token)) > 0)
+            {
+                await uploadFile.WriteAsync(buffer.AsMemory(0, bytesRead), token);
+            }
+            ret = true;
+        }
+        catch (Exception ex)
+        {
+            upload.Error = ex;
+        }
+
+        return ret;
+    }
+}