view:
<form method="post" enctype="multipart/form-data" action="@Url.Action("Upload")">
<input type="file" id="file" name="file"/>
<button>提交</button>
</form>
<form method="post" enctype="multipaview:
<form method="post" enctype="multipart/form-data" action="@Url.Action("Upload")">
<input type="file" id="file" name="file"/>
<button>提交</button>
</form>
<form method="post" enctype="multipa