我对编码和asp.net非常陌生。 我正在创建一个Web应用程序，作为课程工作的一部分。该应用程序允许用户创建原因并签署其他原因。我遇到的问题是，当用户签署第二个原因时，其名称已从第一个原因中删除。我希望这是有道理的，希望能对您有所帮助
这是我的事业的典范。原因有一个列表，该列表将容纳用户并显示给其他用户。
[Key]
public int CauseId { get; set; }
[Required(ErrorMessage = "A Title is required")]
[StringLength(160)]
public string Title { get; set; }
public int UserId { get; set; }
[DisplayName("Category")]
[Required(ErrorMessage = "A Category is required")]
public string Genre { get; set; }
[DisplayName("Created by")]
public string CreatedBy { get; set; }
[ScaffoldColumn(false)]
[DisplayFormat(DataFormatString = "{0:dd MMM yyyy}", ApplyFormatInEditMode = true)]
[DisplayName("Created on")]
public DateTime CreatedTime { get; set; }
[Required(ErrorMessage = "A Description is required")]
[StringLength(10000, MinimumLength = 1)]
[DisplayName("Description")]
public string Description { get; set; }
[Required(ErrorMessage = "A Target is required")]
[Range(10, 1000, ErrorMessage = "Target Signatures must be between 10 and 1000")]
public int Target { get; set; }
public virtual ICollection<SiteUser> Signatures { get; set; }
[DisplayName("No. of Signatures")]
public int SignatureCount { get; set; }
[DisplayName("Cause Image")]
[StringLength(1024)]
public string CauseImageUrl { get; set; }
public string Image { get; set; }
这是我的用户的模型
public int ID { get; set; }
public string Username { get; set; }
public string Email { get; set; }
public string Password { get; set; }
[DisplayName("User Image")]
public string UserImageUrl { get; set; }
这是我为用户签名原因的方法
public JsonResult Sign(int? id)
{
var result = "Fail";
if(id == null)
{
Response.StatusCode = 400;
result = "Bad Request, check input";
return Json(result, JsonRequestBehavior.AllowGet);
}
if (Session["UserID"] == null)
{
Response.StatusCode = 403;
result = "Access forbidden";
return Json(result, JsonRequestBehavior.AllowGet);
}
Cause cause = db.Causes.Find(id);
int memberID = Convert.ToInt32(Session["UserID"].ToString());
SiteUser user = db.SiteUsers.Find(memberID);
cause.Signatures.Add(user);
db.SaveChanges();
Response.StatusCode = 200;
result = "Thanks for signing this cause";
return Json(result, JsonRequestBehavior.AllowGet);
为详细信息视图编码
@model Coursework.Models.Cause
@{ ViewBag.Title = "Details";}
<div class="bg"></div>
<div class="jumbotron" style="height:200px; background-image: url(@Model.CauseImageUrl);">
<h2 class="text-light bg-dark display-1">@Model.Title</h2>
</div>
<div class="container my-5">
<div class="row ">
<div class="col-md-6">
<div class="row">
<div class="col-4">
<h5>Category:</h5>
@Html.DisplayFor(model => model.Genre)
</div>
<div class="col-4">
<h5>
@Html.DisplayNameFor(model => model.CreatedBy):
</h5>
@Html.DisplayFor(model => model.CreatedBy)
</div>
<div class="col-4">
<h5>
@Html.DisplayNameFor(model => model.CreatedTime):
</h5>
@Html.DisplayFor(model => model.CreatedTime)
</div>
</div>
<hr />
<div class="row">
</div>
<h5>Description:</h5>
<p>@Html.DisplayFor(model => model.Description)</p>
</div>
<div class="container col-md-6">
<h5>
Target number of signatures: @Html.DisplayFor(model => model.Target)
</h5>
<div class="progress my-2">
<div class="progress-bar progress-bar-striped progress-bar-animated" id="progressBar" role="progressbar" aria-valuenow="7" aria-valuemin="0" aria-valuemax="100"></div>
</div>
<div class="row">
<div class="col-12">
@{
Html.RenderPartial("_Sign", Model);
}
<div class='signMessage' id='addSignBtn'>Click here to sign</div>
<div id="socialMedia">
<a href="#" class="fab fa-facebook fa-3x"></a>
<a href="#" class="fab fa-twitter fa-3x"></a>
<a href="#" class="fab fa-linkedin fa-3x"></a>
</div>
</div>
</div>
</div>
</div>
</div>
<script>
//Add edit button
$('#addEditBtn').append(' @Html.ActionLink("Edit", "Edit", new { id = Model.CauseId }, new { @class = "btn btn-outline-secondary" })');
$('#addLoginBtn').append('<button type="button" class="btn btn-success mr-2 my-2" data-toggle="modal" data-target="#myModal" style="cursor:pointer" id="loginBtn">Sign</button>');
$('#addSignBtn').append('<button type="button" class="btn btn-success ml-2" style="cursor:pointer" id="signbtn">Sign</button>');
//update progress bar
var progressBar = $('#progressBar');
var progressIncrease = 1/@Model.Target * 100;
var progressWidth = @Model.SignatureCount * progressIncrease;
progressBar.width(progressWidth + "%");
var signaturesTable = $('#signatures');
var $signbtn = $('#signbtn');
//hide thanks message
$('#signSuccess').hide();
//hide sign button if user created this and show edit
$signbtn.on('click', function (event) {
event.preventDefault();
var data = @Model.CauseId.ToString();
$.ajax({
type: "post",
data: data,
url: "/Causes/Sign/@Model.CauseId",
success: function (result) {
if (result = "Thanks for signing this cause") {
$('#signSuccessText').text(result);
progressBar.width(progressWidth + progressIncrease + "%");
$('#signatures').append('<tr><td><img src="@Session["UserImage"]" width="50px"</td><td>@Session["Username"]</td></tr>');
$('#signbtn').fadeOut(500);
$('#addSignBtn').fadeOut(500);
$('#signSuccess').fadeIn(500);
$('#noSigns').hide();
$('#signCount').text(@Model.SignatureCount + 1);
}
}
});
});
</script>
部分视图
@model Coursework.Models.Cause
<h5>Signatures: <span class="badge badge-success" id="signCount">@Model.SignatureCount</span></h5>
<table id="signatures" class="col-sm-12 table table-striped">
<th>
User Image
</th>
<th>
Name
</th>
@foreach (var x in Model.Signatures)
{
<tr>
<td>
<img style="width:50px" src="@x.UserImageUrl" alt="user image" />
</td>
<td>@x.Username</td>
</tr>
}
</table>
@if (Model.Signatures.Count < 1)
{
<div id="noSigns">
<h6>No signatures yet, be the first</h6>
</div>
}
<div>
@Html.Raw(ViewBag.signed)
</div>
<div id="signSuccess" class="alert alert-success alert-dismissible">
<a id="linkClose" class="close" href="#" data-dismiss="alert">×</a>
<div id="signSuccessText">Thanks for signing!</div>
</div>