C# httppostedfilebase在模型中为空

我在我的项目中使用ajax post，即使图像和文本部分在模型中也是有效的，额外的附件为空，在错误部分，错误数量等于我发送到后端的附件数量，并且似乎是对象文件ModelState.values[8]Value.AttemptedValue=[object File]，[object File]，[object File]，[对象文件]、[对象文件]……等等

我的控制器

[HttpPost]
    public ActionResult CreateTheIdea(OneIdeaModel model)
    {
        string imgResult = "";
        string attachmentResult = "OK";
        if (ModelState.IsValid)
        {

        }
    }

我的看法

function sendBasicIdeaInfo() {

    var totalFiles = document.getElementById("coverImage").files.length;
    var covImg = document.getElementById("coverImage").files[0];

    newForm.append("title", $("#title").val());
    newForm.append("coverImage", covImg);
    newForm.append("description", encodeURI($("#description").val()));
    newForm.append("whyThis", encodeURI($("#whyThis").val()));
    newForm.append("detail", encodeURI($("#detail").val()));
    newForm.append("ideaType", encodeURI(ideaType));
    newForm.append("contentId", encodeURI(contentId));
    newForm.append("status", encodeURI(recordType));
    var totalFiles = document.getElementById("uploadBtn").files.length;
    console.log(totalFiles);
    if (totalFiles > 0) {
        for (var i = 0; i < totalFiles; i++) {
            files[i] = document.getElementById("uploadBtn").files[i];
            //console.log(files["name"]);
        }
        newForm.append("attachment", files);
        newForm.append("contentType", "@ContentTypeEnum.IDEA.ToString()");
        //newForm.append("contentId", newIdeaId);
    }

    $.ajax({
        type: 'post',
        url: '/@activeLanguage/Idea/CreateTheIdea',
        data: newForm,
        dataType: 'json',
        contentType: false,
        processData: false,
        success: function (response) {
            if (Number.isInteger(parseInt(response))) {
                complete();
            }
            else
            {
                openVSnackBar("@Resources.errAnError", "error");
            }
        },
        error: function (error) {
            openVSnackBar("@Resources.errAnError", "error");
        }
    });
}

---

假设您正在尝试上载多个文件并尝试绑定到“attachment”属性。这将是您案例的javascript代码-

function sendBasicIdeaInfo() {
    if (window.FormData !== undefined) {
        var totalFiles = document.getElementById("coverImage").files.length;
        var covImg = document.getElementById("coverImage").files[0];

        // Create FormData object
        var newForm = new FormData();

        newForm.append("title", $("#title").val());
        newForm.append("coverImage", covImg);
        newForm.append("description", encodeURI($("#description").val()));
        newForm.append("whyThis", encodeURI($("#whyThis").val()));
        newForm.append("detail", encodeURI($("#detail").val()));
        newForm.append("ideaType", encodeURI(ideaType));
        newForm.append("contentId", encodeURI(contentId));
        newForm.append("status", encodeURI(recordType));
        var totalFiles = document.getElementById("uploadBtn").files.length;
        console.log(totalFiles);
        if (totalFiles > 0) {
            for (var i = 0; i < totalFiles; i++) {
                files[i] = document.getElementById("uploadBtn").files[i];
                newForm.append("attachment", files[i]);         
                //console.log(files["name"]);
            }
            //newForm.append("attachment", files);
            //newForm.append("contentType", "@ContentTypeEnum.IDEA.ToString()");
            //newForm.append("contentId", newIdeaId);
        }

        $.ajax({
            type: 'POST',
            url: '/@activeLanguage/Idea/CreateTheIdea',
            data: newForm,
            contentType: false, // Not to set any content header
            processData: false, // Not to process data
            success: function(response) {
                if (Number.isInteger(parseInt(response))) {
                    complete();
                } else {
                    openVSnackBar("@Resources.errAnError", "error");
                }
            },
            error: function(error) {
                openVSnackBar("@Resources.errAnError", "error");
            }
        });
    } else {
        alert("FormData is not supported.");
    }
}

函数sendbasideainfo（）{ if（window.FormData！==未定义）{ var totalFiles=document.getElementById（“coverImage”）.files.length； var covImg=document.getElementById（“coverImage”）.files[0]； //创建FormData对象 var newForm=new FormData（）； newForm.append（“title”，$（“#title”）.val（）； newForm.append（“coverImage”，covImg）； append（“description”，encodeURI（$（“#description”）.val（））； append（“whyThis”，encodeURI（$（“#whyThis”）.val（））； append（“detail”，encodeURI（$（“#detail”）.val（））； append（“ideaType”，encodeURI（ideaType））； append（“contentId”，encodeURI（contentId））； append（“status”，encodeURI（recordType））； var totalFiles=document.getElementById（“uploadBtn”）.files.length； console.log（totalFiles）； 如果（totalFiles>0）{ 对于（var i=0；i试试这个

if (totalFiles > 0) {
        newForm.append("numberOfAttachment", totalFiles);
        for (var i = 0; i < totalFiles; i++) {
            newForm.append("attachment[" + i + "]", document.getElementById("uploadBtn").files[i]);
        }
    }

if（totalFiles>0）{
append（“numberOfAttachment”，totalFiles）；
对于（var i=0；i

您需要将每个单独的文件追加到

FormData

（您不能追加数组）但是我不知道@StephenMuecke会上传多少个文件，你还有什么建议吗？你只需将每个文件添加到

for

loop@StephenMuecke如果您对（var i=0；i（但您的问题中有太多没有意义的其他代码，如果您生成了正确的视图，那么将只是

var formdata=new formdata（$（'form'）.get（0））；

来序列化所有内容（请参阅）

function sendBasicIdeaInfo() {
    if (window.FormData !== undefined) {
        var totalFiles = document.getElementById("coverImage").files.length;
        var covImg = document.getElementById("coverImage").files[0];

        // Create FormData object
        var newForm = new FormData();

        newForm.append("title", $("#title").val());
        newForm.append("coverImage", covImg);
        newForm.append("description", encodeURI($("#description").val()));
        newForm.append("whyThis", encodeURI($("#whyThis").val()));
        newForm.append("detail", encodeURI($("#detail").val()));
        newForm.append("ideaType", encodeURI(ideaType));
        newForm.append("contentId", encodeURI(contentId));
        newForm.append("status", encodeURI(recordType));
        var totalFiles = document.getElementById("uploadBtn").files.length;
        console.log(totalFiles);
        if (totalFiles > 0) {
            for (var i = 0; i < totalFiles; i++) {
                files[i] = document.getElementById("uploadBtn").files[i];
                newForm.append("attachment", files[i]);         
                //console.log(files["name"]);
            }
            //newForm.append("attachment", files);
            //newForm.append("contentType", "@ContentTypeEnum.IDEA.ToString()");
            //newForm.append("contentId", newIdeaId);
        }

        $.ajax({
            type: 'POST',
            url: '/@activeLanguage/Idea/CreateTheIdea',
            data: newForm,
            contentType: false, // Not to set any content header
            processData: false, // Not to process data
            success: function(response) {
                if (Number.isInteger(parseInt(response))) {
                    complete();
                } else {
                    openVSnackBar("@Resources.errAnError", "error");
                }
            },
            error: function(error) {
                openVSnackBar("@Resources.errAnError", "error");
            }
        });
    } else {
        alert("FormData is not supported.");
    }
}

if (totalFiles > 0) {
        newForm.append("numberOfAttachment", totalFiles);
        for (var i = 0; i < totalFiles; i++) {
            newForm.append("attachment[" + i + "]", document.getElementById("uploadBtn").files[i]);
        }
    }