配置元素未声明

我在 Visual Studio 2012 Express Edition 中做了一些工作，我添加了一个 App.config XML 文件，如下所示:

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
</configuration>

发生的第一件事是出现一个警告，说“‘ configuration’元素没有声明”。有人知道为什么会这样吗？看起来在这个问题解决之前，元素不能在内部声明。

谢谢！

这是整个 XML:

<?xml version="1.0" encoding="utf-8"?>
<configuration>
<appSettings>
<add key="Version" value="779" />
<add key="TimeOut" value="60000" />
<add key="LogFileName" value="Log.txt" />
<!-- your Developer Id with eBay -->
<add key="Environment.DevId" value="" />
<!-- your Application Id with eBay -->
<add key="Environment.AppId" value="" />
<!-- your Application Certificate with eBay -->
<add key="Environment.CertId" value="" />
<!-- API Server URL -->
<!-- For production site use: https://api.ebay.com/wsapi -->
<!-- For Sandbox use: https://api.sandbox.ebay.com/wsapi -->
<add key="Environment.ApiServerUrl" value="https://api.sandbox.ebay.com/wsapi" />
<!-- EPS Server URL -->
<!-- For production site use: https://api.ebay.com/ws/api.dll"/-->
<add key="Environment.EpsServerUrl" value="https://api.sandbox.ebay.com/ws/api.dll" />
<!-- eBay Signin URL -->
<!-- For production site use: https://signin.ebay.com/ws/eBayISAPI.dll?SignIn -->
<!-- https://signin.sandbox.ebay.com/ws/eBayISAPI.dll?SignIn -->
<add key="Environment.SignInUrl" value="https://signin.sandbox.ebay.com/ws/eBayISAPI.dll?SignIn" />
<!-- ViewItem URL -->
<!-- For production site use: http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&amp;item={0} -->
<add key="Environment.ViewItemUrl" value="http://cgi.sandbox.ebay.com/ws/eBayISAPI.dll?ViewItem&amp;item={0}" />
<!-- token is for both API server and EPS server -->
<add key="UserAccount.ApiToken" value="" />
<!-- eBay site ID -->
<add key="UserAccount.eBayUserSiteId" value="0" />
<add key="logexception" value="true"/>
<add key="logmessages" value="true"/>
<add key="logsdkmessages" value="true"/>
<add key="logsdk" value="true"/>
<add key="logfile" value="Log.txt"/>
<!-- Rule Name-->
<add key="RuName" value=""/>
<!-- Set this if you access eBay API server behind a proxy server-->
<add key="Proxy.Host" value =""/>
<add key="Proxy.Port" value =""/>
<!-- set proxy server username/password if necessary-->
<add key="Proxy.Username" value=""/>
<add key="Proxy.Password" value=""/>

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<configuration xmlns="schema URL">
<!-- configuration settings -->
</configuration>

do changes,like above & try

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最佳答案

I had the same issue. It is not an error, it is simply a warning; so your application should still compile. I used the following simple config file and the warning is still produced.

<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<startup>
<supportedRuntime
version="v4.0"sku=".NETFramework,
Version=v4.5"/>
</startup>
</configuration>

It is an issue that has been raised on the MSDN website, but it does not seem to have been satisfactorily resolved. See link below:

http://social.msdn.microsoft.com/Forums/en-US/Vsexpressvcs/thread/18a1074f-668f-4fe3-a8d9-4440db797439

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Go to XML menu (visual studio top menu item) choose schemas and find for DotNetConfig.xsd and choose Use this schema.

XML - Schemas

Edit XML Schema

Your problem will resolve for sure

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I had to -> Go to XML menu (visual studio top menu item) choose schemas and select DotNetConfig.xsd AND RazorCustomSchema.xsd AND EntityFrameworkConfig_6_1_0.xsd

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Visual Studio 2013 Express Edition is missing the DotNetConfig.xsd (https://connect.microsoft.com/VisualStudio/feedback/details/817322/dotnetconfig-xsd-files-not-present-in-vs-2013-express-for-desktop).

So to get rid of the warning in VS 2013 Express:

The warning should be gone.

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I just had this warning popup inside an autogenerated xml file while working on a xaml project.

Using Debug->Clean Solution and Debug->Rebuild Solution fixed it. Might want to try that before getting fancy with the schemas.

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Choose use this schema. DotNetConfig.xsd

XLM Menu..... Visual Studio

Works perfectly.

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I was having less space on my drive which might have resulted in incomplete loading of my application solution. This "the-configuration-element-is-not-declared" problem got solved after i created some space on my drive.

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I also got the same warning. After thinking about for some time I realized my error working with SQL (MS SQL).

Warning: the 'configuration' element is not declared

Using C#

App.Config code:

<connectionStrings>
<add name="dbx" connectionString="Data Source=ServerNameHere;Initial Catalog=DatabaseNameHere;Integrated Security=True" providerName="System.Data.SqlClient"/>
</connectionStrings>

*this calls out the database name in the connectionStrings, when I plugged in my SQL code as a practice I always use the database name, schema, then table. This practice didn't carry over well in Visual Studio as I am a beginner. I removed the db name from my SQL syntax and only called from the schema, data table. This resolved the issue for me.

Form.CS:

 using (SqlCommand cmd = new SqlCommand("SELECT * FROM [DatabaseName].[Schema].[TableName] WHERE [MEPeriod] = '2020-06-01'", con))

Updated to:

using (SqlCommand cmd = new SqlCommand("SELECT * FROM [Schema].[TableName] WHERE [MEPeriod] = '2020-06-01'", con))

This worked for me, I hope this is found as useful.


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