Sql 使用数据库中的标记列表索引越界异常

在编辑中尝试向视频添加标记时，似乎无法理解标记列表为何出现越界异常。我认为ilist会在需要时自动为某个项目创建一个新位置。。。标签应该与给定的视频相关联；因此，它应该生成一个新标签并与视频关联。但是，我有点搞砸了，比如使用Session.merge而不是Session.save，这样会生成一个新视频，而不是一个新标签。。。但保留标记[i].tagdescription不变会生成outofbounds异常。我相信答案是显而易见的，但我还是想不起来

编辑视图

@model PatientEducationAdmin.Models.Domain.Video

@{
    ViewBag.Title = "Edit";
}
@*putting black outline on text boxes*@

@*editors location*@
<div id="div8class" style="background-color: beige; width: 936px; border-bottom-left-radius: 15px; border-bottom-right-radius: 15px">
    <h2>Edit</h2>

    @using (Html.BeginForm())
    {
        @Html.ValidationSummary(true)



@*edit for tags*@


        <div class="editor-field">
            <table style="text-align: center; align-content: center; float: none; margin: 10px auto; width: 500px;">
                <tr>

                    <th>@Html.DisplayNameFor(model => model.Tags[0].TagID)</th>
                    <th>@Html.DisplayNameFor(model => model.Tags)</th>

                </tr>



                @{int i = 0;}
                @using PatientEducationAdmin.Models.DAL.Repositories
                @{ TagRepository tagDB = new TagRepository();}
                @foreach (var item in Model.Tags)
                {
                    <tr>

                        <td>
                            @Html.TextBoxFor(modelitem => item.TagID, new { @readonly = "readonly" })


                        </td>
                        <td>
                            @Html.TextBoxFor(modelItem => item.TagDescription, new { @readonly = "readonly" })


                        </td>
                        <td>
                            <button type="button" onclick="delTag()">Delete</button>
                            @*want a button to delete a specific tag or disassociate it from video...*@

                        </td>

                    </tr>
                    <tr>

                        @{i++;}
                    </tr>
                }

            </table>
            <div class="editor-field">

                @Html.EditorFor(model => model.Tags[i], new { id = "tagadd" })
                <button>Add Tag</button>
            </div>
        </div>
        <p>
            <input type="submit" value="Save" />
        </p>

    }

    <div>
        @Html.ActionLink("Back to List", "SearchVideos")
    </div>

    @section Scripts {
        @Scripts.Render("~/bundles/jqueryval")
    }
</div>

调用堆栈

mscorlib.dll!System.ThrowHelper.ThrowArgumentOutOfRangeException() + 0x49 bytes 

mscorlib.dll！System.Collections.Generic.List.this[int].get（int index=1）+0x23字节

NHibernate.dll!NHibernate.Collection.Generic.PersistentGenericBag<PatientEducationAdmin.Models.Domain.Tag>.System.Collections.Generic.IList<T>.get_Item(int index = 1) + 0x87 bytes 
[Lightweight Function]  


System.Web.Mvc.dll!System.Web.Mvc.ExpressionUtil.CachedExpressionCompiler.Compiler<PatientEducationAdmin.Models.Domain.Video,PatientEducationAdmin.Models.Domain.Tag>.CompileFromFingerprint.AnonymousMethod__4(PatientEducationAdmin.Models.Domain.Video model = {PatientEducationAdmin.Models.Domain.Video}) + 0x42 bytes 


System.Web.Mvc.dll!System.Web.Mvc.ModelMetadata.FromLambdaExpression<PatientEducationAdmin.Models.Domain.Video,PatientEducationAdmin.Models.Domain.Tag>.AnonymousMethod__2() + 0x88 bytes   


System.Web.Mvc.dll!System.Web.Mvc.ModelMetadata.Model.get() + 0x3c bytes    

NHibernate.dll！NHibernate.Collection.Generic.PersistentGenericBag.System.Collections.Generic.IList.get_项（int index=1）+0x87字节
[轻量级功能]
System.Web.Mvc.dll！System.Web.Mvc.ExpressionUtil.CachedExpressionCompiler.Compiler.CompileFromFingerprint.AnonymousMethod_uu4（PatientEducationAdmin.Models.Domain.Video model={PatientEducationAdmin.Models.Domain.Video}）+0x42字节
System.Web.Mvc.dll！System.Web.Mvc.ModelMetadata.FromLambdaExpression.AnonymousMethod__2（）+0x88字节
System.Web.Mvc.dll！System.Web.Mvc.ModelMetadata.Model.get（）+0x3c字节

System.Web.Mvc.dll！System.Web.Mvc.Html.TemplateHelpers.TemplateHelper（System.Web.Mvc.HtmlHelper Html={System.Web.Mvc.HtmlHelper}

System.Web.Mvc.ModelMetadata metadata={System.Web.Mvc.CachedDataAnnotationsModelMetadata}，字符串htmlFieldName=“Tags[1]”，字符串templateName=null，System.Web.UI.WebControl.DataboundControls mode=Edit，对象additionalViewData={id=“tagadd”}

System.Web.Mvc.Html.TemplateHelpers.ExecuteTemplateDelegate executeTemplate={Method={System.Reflection.RuntimeMethodInfo}}}）+0x94字节
System.Web.Mvc.dll！System.Web.Mvc.Html.TemplateHelpers.TemplateHelper（System.Web.Mvc.HtmlHelper Html={System.Web.Mvc.HtmlHelper}，System.Web.Mvc.ModelMetadata元数据={System.Web.Mvc.CachedDataAnnotationsModelMetadata}，字符串htmlFieldName=“Tags[1]”，string templateName=null，System.Web.UI.WebControls.DataBoundControlMode=Edit，object additionalViewData={id=“tagadd”}）+0x5f字节
System.Web.Mvc.dll！System.Web.Mvc.Html.TemplateHelpers.TemplateFor（System.Web.Mvc.HtmlHelper Html={System.Web.Mvc.HtmlHelper}

System.Linq.Expressions.Expression>Expression={System.Linq.Expressions.Expression>}，string templateName=null，string htmlFieldName=null，System.Web.UI.WebControl.DataBoundControlMode=Edit，object additionalViewData={id=“tagadd”}

System.Web.Mvc.Html.TemplateHelpers.TemplateHelperDelegate templateHelper={Method={System.Reflection.RuntimeMethodInfo}}）+0xe4字节
System.Web.Mvc.dll！System.Web.Mvc.Html.TemplateHelpers.TemplateFor（System.Web.Mvc.HtmlHelper Html={System.Web.Mvc.HtmlHelper}

System.Linq.Expressions.Expression>Expression={System.Linq.Expressions.Expression>}，string templateName=null，string htmlFieldName=null，System.Web.UI.WebControls.DataBoundControlMode=Edit，object additionalViewData={id=“tagadd”}）+0x8d字节
System.Web.Mvc.dll！System.Web.Mvc.Html.EditorExtensions.EditorFor（System.Web.Mvc.HtmlHelper Html={System.Web.Mvc.HtmlHelper}

System.Linq.Expressions.Expression>Expression={System.Linq.Expressions.Expression>}，对象additionalViewData={id=“tagadd”}）+0x5e字节

App\u Web\u gfall1nh.dll！ASP.\页面\视图\视频\编辑\ cshtml.Execute（）行138+0x27b字节C# System.Web.WebPages.dll！System.Web.WebPages.WebPageBase.ExecutePageHierarchy（）+0xc6字节 System.Web.Mvc.dll！System.Web.Mvc.WebViewPage.ExecutePageHierarchy（）+0x78字节
System.Web.WebPages.dll！System.Web.WebPages.StartPage.RunPage（）+0x12字节
System.Web.WebPages.dll！System.Web.WebPages.StartPage.ExecutePageHierarchy（）+0x3f字节
System.Web.WebPages.dll！System.Web.WebPages.WebPageBase.ExecutePageHierarchy（System.Web.WebPages.WebPageContext pageContext，System.IO.TextWriter writer，System.Web.WebPages.WebPageRenderingBase startPage）+0x4d字节
System.Web.Mvc.dll！System.Web.Mvc.RazorView.RenderView（System.Web.Mvc.ViewContext ViewContext={System.Web.Mvc.ViewContext}，System.IO.TextWriter writer={System.Web.HttpWriter}，对象实例={ASP.\U页面\视图\视频\编辑\ cshtml}）+0x2e8字节
System.Web.Mvc.dll！System.Web.Mvc.BuildManagerCompiledView.Render（System.Web.Mvc.ViewContext ViewContext={System.Web.Mvc.ViewContext}，System.IO.TextWriter writer={System.Web.HttpWriter}）+0x17f字节
System.Web.Mvc.dll！System.Web.Mvc.ViewResultBase.ExecuterResult（System.Web.Mvc.ControllerContext上下文={System.Web.Mvc.ControllerContext}）+0x1b0字节 System.Web.Mvc.dll！System.Web.Mvc.ControllerActionInvoker.InvokeActionResult（System.Web.Mvc.ControllerContext ControllerContext={System.Web.Mvc.ControllerContext}，System.Web.Mvc.ActionResult ActionResult={System.Web.Mvc.ViewResult}）+0x28字节
System.Web.Mvc.dll！System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters.AnonymousMethod_17（）+0x4b字节
System.Web.Mvc.dll！System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter（System.Web.Mvc.IResultFilter={PatientEducationAdmin.Controllers.VideoController}，System.Web.Mvc.ResultExecutionContext前文本={System.Web.Mvc.ResultExecutionContext}，System.Func continuation={Method={System.Reflection.RuntimeMethodInfo}）+0xb2字节
System.Web.Mvc.dll！System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters.AnonymousMethod_19（）+0x49字节
System.Web.Mvc.dll！System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters（System.Web.Mvc.ControllerContext ControllerContext=

NHibernate.dll!NHibernate.Collection.Generic.PersistentGenericBag<PatientEducationAdmin.Models.Domain.Tag>.System.Collections.Generic.IList<T>.get_Item(int index = 1) + 0x87 bytes 
[Lightweight Function]  


System.Web.Mvc.dll!System.Web.Mvc.ExpressionUtil.CachedExpressionCompiler.Compiler<PatientEducationAdmin.Models.Domain.Video,PatientEducationAdmin.Models.Domain.Tag>.CompileFromFingerprint.AnonymousMethod__4(PatientEducationAdmin.Models.Domain.Video model = {PatientEducationAdmin.Models.Domain.Video}) + 0x42 bytes 


System.Web.Mvc.dll!System.Web.Mvc.ModelMetadata.FromLambdaExpression<PatientEducationAdmin.Models.Domain.Video,PatientEducationAdmin.Models.Domain.Tag>.AnonymousMethod__2() + 0x88 bytes   


System.Web.Mvc.dll!System.Web.Mvc.ModelMetadata.Model.get() + 0x3c bytes    

@Model.Tags.Add(new Tag());
@Html.EditorFor(model => model.Tags[i], new { id = "tagadd" })