Question

我试图在webforms中上传带有ajax和vb.net的文件。我目前正在从ajax获得成功响应，但我实际上从未在后端遇到断点，也没有上传或停止代码执行。这是我第一次尝试这个，所以我不确定如何专门处理后端，我在网上找到的所有东西都不符合我的确切规格。该文件需要作为varbinary直接上传到db列。几乎所有文件都将少于256kb，因此我决定不将它们存储在文件系统中。

                <DataTemplate>
                <Grid>
                    <TextBlock Visibility="Collapsed" Name="Hyperlink">
            <Hyperlink NavigateUri="{Binding Data.path}">
            </Hyperlink>
                    </TextBlock>
            <TextBlock Visibility="Collapsed" Name="simpleText"
                       Text="{Binding Data.path}"></TextBlock>
                </Grid>
                <DataTemplate.Triggers>
                    <DataTrigger Binding="{Binding Data.IsValidURL}" //your boolean property
                                 Value="True">
            <Setter TargetName="Hyperlink"
                                Property="Vibility"
                                Value="Visible" />
                    </DataTrigger>
            <DataTrigger Binding="{Binding Data.IsValidURL}" //your boolean property
                                 Value="False">
            <Setter TargetName="simpleText"
                    Property="Vibility"
                    Value="Visible" />
            </DataTrigger>
            <DataTemplate.Triggers>
            </DataTemplate>

<input class="pull-left" type="file" id="fileToUpload"/>
<button type="button" class="btn btn-primary" data-action="uploadDoc">Upload</button>

uploadButton.on("click", function () {
    var form = new FormData();
    var inputFile = document.getElementById("fileToUpload");
    form.append("file", inputFile.files[0]);
    alert(inputFile.files.length);
    $.ajax({
        url: '../secure/shipments.aspx/UploadFile',
        data: form,
        processData: false,
        contentType: false,
        type: 'POST',
        success: function (data) {
            alert(data);
        },
        error: function (xhr, textStatus, errorThrown) {
            alert("There was an error uploading the file.  " + xhr.status + ': ' + errorThrown);
        },
        cache: false
    });
});

DB结构：

Answer 1

好的事实证明你不能或我不知道如何将文件发布到.aspx页面，所以我最终创建了一个.ashx处理程序页面。

Public Sub ProcessRequest(ByVal context As HttpContext) Implements IHttpHandler.ProcessRequest
        Dim postedfile As HttpPostedFile = context.Request.Files("file")
        Dim ftype As String = postedfile.ContentType
        Dim flen As Integer = postedfile.ContentLength
        Dim mystream As System.IO.Stream = postedfile.InputStream
        Dim inputArray(flen) As Byte
        Dim datasource As String = String.Empty

        mystream.Read(inputArray, 0, flen)

        If Not HttpContext.Current.Session.Contents("datasource") Is Nothing Then datasource = HttpContext.Current.Session.Contents("datasource").ToString()
        Try
            Using con As New SqlConnection(datasource)
                Using cmd As New SqlCommand
                    cmd.CommandText = "test_insertDoc"
                    cmd.CommandType = CommandType.StoredProcedure
                    cmd.Parameters.AddWithValue("referenceno", "2")
                    cmd.Parameters.AddWithValue("doctype", ftype)
                    cmd.Parameters.AddWithValue("line", 0)

                    cmd.Parameters.Add("uploadedFile", SqlDbType.VarBinary, -1).Value = inputArray

                    cmd.Parameters.AddWithValue("customer", "0")
                    cmd.Parameters.AddWithValue("warehouse", "0")
                    cmd.Connection = con
                    con.Open()
                    cmd.ExecuteNonQuery()
                    con.Close()
                    cmd.Dispose()
                End Using
            End Using
        Catch ex As Exception
            Dim message As String = ex.Message
        End Try
End Sub

$.ajax({
    data: form,
    processData: false,
    contentType: false,
    type: 'POST',
    datatype: 'json',
    url: '../secure/FileUpload.ashx',
    success: function (data) {

    },
    error: function (xhr, textStatus, errorThrown) {
        alert("There was an error uploading the file.  " + xhr.status + ': ' + errorThrown);
    },
    cache: false
});

FormData的Ajax发布取得了成功，但没有达到VB.Net功能

1 个答案: