The C # "Sources" parameter specifies multiple error Solutions

The "Sources" parameter is specified multiple times. Repeated items are not supported for the "Sources" parameter.

Yesterday, I encountered this error while compiling the project. After a long period of time, it could not be solved.

I hope this article will help people who encounter this error solve the problem as soon as possible.

 

The problem occurs when the project file. cspro opens the project file with notepad and finds

1. <ItemGroup>
<Compile Include = "Converters \ AspNetAjaxDateTimeConverter. cs"/>
<Compile Include = "Converters \ XmlNodeConverter. cs"/>
<Compile Include = "Converters \ HtmlColorConverter. cs"/>
<Compile Include = "JavaScriptParameters. cs"/>
<Compile Include = "JavaScriptConstructor. cs"/>
<Compile Include = "JsonIgnoreAttribute. cs"/>
<Compile Include = "Utilities \ CollectionUtils. cs"/>
<Compile Include = "Utilities \ ReflectionUtils. cs"/>
<Compile Include = "Utilities \ StringUtils. cs"/>
</ItemGroup>

Two identical include files are found. Deleting one can solve the problem.

 

2. If it is not possible to delete the compilation, select the properties of the project or class library and remove the check box in the image:

Figure:

 

 

Note: You can perform both steps.

Author: lovexxiao1314