c#-文件切片上传

前台代码：

<form id="uploadForm" enctype="multipart/form-data">
    <input type="file" name="file" id="fileInput" multiple />
    <button type="button" onclick="onuploadForm()">上传</button>
</form>
<div id="progressBar" style="background-color: lightgray; height: 20px;"></div>
<script src="https://code.jquery.com/jquery-3.3.1.min.js"></script>
<script>
    function onuploadForm() {
        var file = $('#fileInput').get(0).files[0];

        var chunkSize = 1024 * 1024; // 1MB
        var fileSize = file.size;
        var totalChunks = Math.ceil(fileSize / chunkSize);
        var currentChunk = 0;

        var uploadChunk = function () {
            var start = currentChunk * chunkSize;
            var end = Math.min(start + chunkSize, fileSize);

            var formData = new FormData();
            formData.append('file', file.slice(start, end));
            formData.append('totalChunks', totalChunks);
            formData.append('currentChunk', currentChunk);

            $.ajax({
                url: '/File/ProcessChunk',
                type: 'POST',
                data: formData,
                contentType: false,
                processData: false,
                beforeSend: function () {
                    // 在发送请求之前，初始化一些相关操作
                    $('#progressBar').width('0%');
                    $('#progressBar').text('0%');
                },
                uploadProgress: function (event, position, total, percentComplete) {
                    // 在上传过程中更新进度条
                    var percent = percentComplete.toFixed(2) + '%';
                    $('#progressBar').width(percent);
                    $('#progressBar').text(percent);
                },
                success: function (result) {
                    currentChunk++;

                    if (currentChunk < totalChunks) {
                        uploadChunk();
                    } else {
                        console.log('文件上传成功');
                        mergeChunks(result.fileName, result.totalChunks);
                    }
                },
                error: function (error) {
                    console.log(error);
                }
            });
        };

        uploadChunk();
    }

    // 合并切片请求
    function mergeChunks(fileName, totalChunks) {
        $.ajax({
            type: "POST",
            url: "/File/MergeChunks",
            data: { fileName: fileName, totalChunks: totalChunks },
            success: function (result) {
                console.log(result);
                if (result.success) {
                    alert('文件上传并合并成功');
                } else {
                    alert('合并切片失败');
                }
            },
            error: function () {
                alert('合并切片请求错误');
            }
        });
    }
</script>

后台mvc代码：

 [HttpPost]
        public IActionResult ProcessChunk(IFormFile file, int totalChunks, int currentChunk)
        {
            var uploadsFolderPath = Path.Combine(Directory.GetCurrentDirectory(), "Uploads");
            var fileName = Path.GetFileName(file.FileName);
            var filePath = Path.Combine(uploadsFolderPath, fileName + $".part{currentChunk}");

            using (var stream = new FileStream(filePath, FileMode.Create))
            {
                file.CopyTo(stream);
            }

            return Ok();
        }

        [HttpPost]
        public IActionResult MergeChunks(string fileName, int totalChunks)
        {
            var uploadsFolderPath = Path.Combine(Directory.GetCurrentDirectory(), "Uploads");
            var mergedFilePath = Path.Combine(uploadsFolderPath, fileName);

            using (var mergedFileStream = new FileStream(mergedFilePath, FileMode.Create))
            {
                for (int i = 0; i < totalChunks; i++)
                {
                    var partFilePath = Path.Combine(uploadsFolderPath, fileName + $".part{i}");

                    using (var partFileStream = new FileStream(partFilePath, FileMode.Open))
                    {
                        partFileStream.CopyTo(mergedFileStream);
                    }

                    System.IO.File.Delete(partFilePath);
                }
            }

            return Ok();
        }

要是对进度条不满意 可使用下面的：

<div class="progress-bar" style="display:none">
    <div class="progress"></div>
</div>
<style>

 .progress-bar {
     width: 100%;
     height: 20px;
     background-color: #f0f0f0;
     border-radius: 10px;
     overflow: hidden;
     position: relative;
 }

 .progress {
     height: 100%;
     background-color: #4caf50;
     width: 0;
     transition: width 0.5s ease-in-out;
     position: absolute;
     top: 0;
     left: 0;
 }
</style>

至于对进度条赋值:

$('.progress').css('width', percentComplete + '%');

 建议：js不要使用alert 弹框  避免影响进度条加载进度  优先考虑使用如layui 中下面这种方式

layer.msg('文件上传并合并成功', { icon: 1 });