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“/”應(yīng)用程序中的服務(wù)器錯(cuò)誤。

The context cannot be used while the model is being created. This exception may be thrown if the context is used inside the OnModelCreating method or if the same context instance is accessed by multiple threads concurrently. Note that instance members of DbContext and related classes are not guaranteed to be thread safe.

說明: 執(zhí)行當(dāng)前 Web 請(qǐng)求期間,出現(xiàn)未經(jīng)處理的異常。請(qǐng)檢查堆棧跟蹤信息,以了解有關(guān)該錯(cuò)誤以及代碼中導(dǎo)致錯(cuò)誤的出處的詳細(xì)信息。

異常詳細(xì)信息: System.InvalidOperationException: The context cannot be used while the model is being created. This exception may be thrown if the context is used inside the OnModelCreating method or if the same context instance is accessed by multiple threads concurrently. Note that instance members of DbContext and related classes are not guaranteed to be thread safe.

源錯(cuò)誤:


行 1:  @{PreviousNext.Get(Data);}
行 2:  <div class="fanhui"> <a href="@(Data.culture)/news.html">返回列表</a></div>
行 3:  <div class="PreveNext">

源文件: d:\webhosting\clients\c7620f37-9f2f-4b80-8a37-ccfe557b5096\wwwroot\Data\sz-kaixin\template\cn\程序代碼\部件\_PreviousNext.cshtml    行: 1

堆棧跟蹤:


[InvalidOperationException: The context cannot be used while the model is being created. This exception may be thrown if the context is used inside the OnModelCreating method or if the same context instance is accessed by multiple threads concurrently. Note that instance members of DbContext and related classes are not guaranteed to be thread safe.]
   System.Data.Entity.Internal.LazyInternalContext.InitializeContext() +863
   System.Data.Entity.Internal.InternalContext.Initialize() +20
   System.Data.Entity.Internal.InternalContext.GetEntitySetAndBaseTypeForType(Type entityType) +16
   System.Data.Entity.Internal.Linq.InternalSet`1.Initialize() +53
   System.Data.Entity.Internal.Linq.InternalSet`1.AsNoTracking() +18
   System.Data.Entity.Infrastructure.DbQuery`1.AsNoTracking() +46
   QibuCMS.PreviousNext.Get(ViewModel model) +160
   ASP._Page_Data_sz_kaixin_template_cn_程序代碼_部件__PreviousNext_cshtml.Execute() in d:\webhosting\clients\c7620f37-9f2f-4b80-8a37-ccfe557b5096\wwwroot\Data\sz-kaixin\template\cn\程序代碼\部件\_PreviousNext.cshtml:1
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +197
   System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +105
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +90
   System.Web.WebPages.<>c__DisplayClass40_0.<RenderPageCore>b__0(TextWriter writer) +232
   System.Web.WebPages.HelperResult.WriteTo(TextWriter writer) +10
   System.Web.WebPages.WebPageBase.Write(HelperResult result) +80
   ASP._Page_Data_sz_kaixin_template_cn_程序代碼_new_cshtml.Execute() in d:\webhosting\clients\c7620f37-9f2f-4b80-8a37-ccfe557b5096\wwwroot\Data\sz-kaixin\template\cn\程序代碼\new.cshtml:7
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +197
   System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +105
   System.Web.WebPages.StartPage.RunPage() +17
   System.Web.WebPages.StartPage.ExecutePageHierarchy() +73
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +78
   System.Web.Mvc.RazorView.RenderView(ViewContext viewContext, TextWriter writer, Object instance) +256
   System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer) +107
   System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) +291
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult) +13
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +56
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +420
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +420
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult) +52
   System.Web.Mvc.Async.<>c__DisplayClass3_6.<BeginInvokeAction>b__3() +198
   System.Web.Mvc.Async.<>c__DisplayClass3_1.<BeginInvokeAction>b__5(IAsyncResult asyncResult) +100
   System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +10
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +48
   System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +27
   System.Web.Mvc.<>c.<BeginExecuteCore>b__152_1(IAsyncResult asyncResult, ExecuteCoreState innerState) +11
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +29
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +48
   System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +47
   System.Web.Mvc.<>c.<BeginExecute>b__151_2(IAsyncResult asyncResult, Controller controller) +13
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +22
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +48
   System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +28
   System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +10
   System.Web.Mvc.<>c.<BeginProcessRequest>b__20_1(IAsyncResult asyncResult, ProcessRequestState innerState) +28
   System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +29
   System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +48
   System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +28
   System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9
   System.Web.CallHandlerExecutionStep.InvokeEndHandler(IAsyncResult ar) +152
   System.Web.CallHandlerExecutionStep.OnAsyncHandlerCompletion(IAsyncResult ar) +125


版本信息: Microsoft .NET Framework 版本:4.0.30319; ASP.NET 版本:4.7.3930.0
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新聞資訊

鍍鉻拉桿加工工藝
發(fā)布時(shí)間:2024-10-23點(diǎn)擊率:1297

鍍鉻拉桿在汽車配件、電器、家具、航空航天等領(lǐng)域應(yīng)用廣泛,其優(yōu)良的防腐蝕、高硬度和光潔度等特性備受青睞。鍍鉻拉桿的加工工藝流程主要包括以下步驟:


一、原材料準(zhǔn)備

首先,需要選用高質(zhì)量的合金鋼或不銹鋼材料,這些材料具有優(yōu)良的機(jī)械性能和耐腐蝕性。在加工前,要對(duì)原材料進(jìn)行質(zhì)量檢查,確保其規(guī)格、尺寸和表面質(zhì)量等符合要求。


二、切割下料

根據(jù)產(chǎn)品圖紙要求,使用切割機(jī)將原材料切割成所需長度。不同的材料需要選擇不同的切割方式,如激光切割、等離子切割等,以保證切割質(zhì)量和效率。


三、調(diào)質(zhì)處理

為了提高材料的機(jī)械性能,需要對(duì)切割后的拉桿進(jìn)行調(diào)質(zhì)處理。調(diào)質(zhì)處理過程中,鋼材內(nèi)部的組織結(jié)構(gòu)會(huì)發(fā)生變化,使其更加均勻,從而提高其強(qiáng)度和韌性。常用的調(diào)質(zhì)處理方法有淬火和回火等。


四、拋光處理

拋光處理是鍍鉻拉桿加工中的重要環(huán)節(jié),其目的是去除拉桿表面雜質(zhì)、劃痕和不平整部分,使表面更加光滑、平整。拋光處理可以采用機(jī)械拋光、化學(xué)拋光或電解拋光等方式,根據(jù)不同的材料和表面質(zhì)量要求選擇合適的拋光方法。


五、鍍鉻處理

鍍鉻處理是拉桿加工中的關(guān)鍵環(huán)節(jié),其目的是在拉桿表面形成一層致密的鉻鍍層,以提高拉桿的防腐蝕性和耐磨性。鍍鉻處理可以采用電鍍或化學(xué)鍍等方式,根據(jù)不同的使用要求選擇合適的鍍鉻工藝。在鍍鉻過程中,要嚴(yán)格控制鍍液的成分和溫度等參數(shù),以保證鍍層的厚度和質(zhì)量。


六、質(zhì)量檢測

最后,要對(duì)鍍鉻拉桿進(jìn)行質(zhì)量檢測,包括外觀質(zhì)量、尺寸精度和性能測試等。外觀質(zhì)量檢測可以采用目視法或測量儀器等方法,尺寸精度可以使用卡尺或測量儀器等進(jìn)行檢測。性能測試包括硬度測試、耐腐蝕性測試和力學(xué)性能測試等,以檢驗(yàn)鍍鉻拉桿的各項(xiàng)性能指標(biāo)是否符合要求。


鍍鉻拉桿加工工藝流程中需要注意以下幾點(diǎn):

1. 原材料質(zhì)量是影響拉桿質(zhì)量的關(guān)鍵因素之一,因此要選用優(yōu)質(zhì)的材料,并進(jìn)行嚴(yán)格的質(zhì)量檢測。

2. 切割下料時(shí)要根據(jù)材料類型和厚度選擇合適的切割方式,以保證切割質(zhì)量和效率。

3. 調(diào)質(zhì)處理是提高材料機(jī)械性能的重要環(huán)節(jié),需要選擇合適的處理方式和工藝參數(shù)。

4. 拋光處理是保證拉桿表面質(zhì)量的關(guān)鍵步驟,需要根據(jù)材料和表面質(zhì)量要求選擇合適的拋光方法。

5. 鍍鉻處理是提高拉桿防腐蝕性和耐磨性的關(guān)鍵環(huán)節(jié),需要選擇合適的鍍鉻工藝參數(shù)和控制方法。