This can be easily solved by allowing MARS in your connection string. Add MultipleActiveResultSets=true to the provider part of your connection string (where Data Source, Initial Catalog, etc. are specified). http://msdn.microsoft.com/en-us/library/h…
Fixing the "There is already an open DataReader associated with this Command which must be closed first." exception in Entity Framework 下面代码可能会报如标题所示错误 var contacts = from c in db.Contact select c; foreach (Contact c in contacts) { if (c.Phones.…
执行SqlDataReader.Read之后,如果还想用另一个SqlCommand执行Insert或者Update操作的话,会得到一个错误提示:There is already an open DataReader associated with this Command which must be closed first.,然后一般就会产生数据保存失败的异常. 解决方法是在ConnectionString中加上一个参数“MultipleActiveResultSets”, 将其值设置为tru…
原文:https://www.cnblogs.com/sdusrz/p/4433108.html 执行SqlDataReader.Read之后,如果还想用另一个SqlCommand执行Insert或者Update操作的话,会得到一个错误提示:There is already an open DataReader associated with this Command which must be closed first.,然后一般就会产生数据保存失败的异常. 解决方法是在ConnectionS…
在实体对象中访问导航属性里的属性值出现异常“There is already an open DataReader associated with this Command which must be closed first”. public class User { public long UserId { get; set; } public string UserName { get; set; } public string UserPwd { get; set; } public D…
使用MVC4 EF Linq获取foreach列表循环的时候遇到了如下的问题:报错提示 There is already an open DataReader associated with this Connection which must be closed first 解决方法如下红色所示: @foreach (var item in Model.ToList()) { @Html.ActionLink(@item.user.nickname + "(微信)", "…
[参考]There is already an open datareader associated with this command引发的问题 我在语句中并未使用 DataReader,未何也提示同样的错误,这个DataReader隐藏在哪里,我给大家在这里指出来,由于本人研究的还不够深入,只知道有一种方法的调用后会生成 DataReader,我想这也是绝大多数人遇到头疼的问题. 在使用数据库更新或插入语句时,大家通常使用 SqlCommand 的 ExecuteNonQuery() 方法,…
问题:System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation. ---> System.InvalidOperationException: The class 'xxxx' has no parameterless constructor. 场景:查询角色信息 public Class Role:Entity<string> { publi…
XCODE5.0升到XCODE5.1后LLVM也从5.0升到5.1,工程报下面的错误了: clang: error: unknown argument: '-fobj-arc' [-Wunused-command-line-argument-hard-error-in-future] clang: note: this will be a hard error (cannot be downgraded to a warning) in the future Command /Applicati…
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This morning when I do apt-get update on my new Ubuntu 14.04 server, I got these error messages: Reading package lists… Done W: GPG error: http://security.ubuntu.com trusty-security Release: The following signatures couldn’t be verified because the…
http://www.briandunning.com/error-codes/?source=Windows Windows Error Codes List All Error Codes | Search Errors: FileMaker Error Codes Lasso Error Codes MySQL Error Codes Windows System Errors About this databaseThis is a free public resource. It is…
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总结列表: 1. There is already an open DataReader associated with this Connection which must be closed first 2. npm install 失败 3. WebApi HTTP Put 405 Method not allowed 服务器升级了IIS,WebApi项目的put接口全部报405 搜索发现解决方案不少,尝试了张善友博客给出的解决方案,问题解决. IIS7.5上的REST服务的Put操作发生…
