以下是一个演示示例:

控制器:

public IActionResult ModalPartial() {
            return View();
        }
        public IActionResult Save(ParentViewModel pdata) {
            return View();
        }

ModalPartial.cshtml:

ModalPartial.cshtml:

<div class="row">
    <div class="col-md-6">
        <div>
            <span class="font-weight-bold">Child Name</span><br />
            <div class="pt-2 pb-2"><input id="name" type="text" class="form-control" /></div>
            <input type="file" id="images" multiple />
        </div>
        <button onclick="save()">save</button>
    </div>
</div>
@section scripts{
    <script type="text/javascript">
        function save(){
            var pdata = new FormData();
            pdata.append('ParentName', 'Anne');
            pdata.append('Child.ChildName', 'Sam');
           
                var files = $("#images").get(0).files;
            for (var i = 0; i < files.length; i++) {
                pdata.append('Child.Images', files[i]);
            }
            
          

            $.ajax({
                url: "Save",
                type: "POST",
                data: pdata ,
                processData: false,
                
                contentType: false,
                success: function (data) { }
            });
    }
    </script>
}        

结果: