using System;
using System.Xml;
using System.Xml.Linq;
using System.Linq;
using System.Text;

namespace Q101287
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.OutputEncoding = Encoding.UTF8;

            //不规范xml
            var xml = @"<Language Key=""lbl_ResponsibleDeclarationDetail"">
<value>
<p>福建省地方就看电视剧</p>
<p>福建省地方就看电视剧</p>
<p>福建省地方就看电视剧</p>
</value>
</Language>";
            var elementsAsString = XElement.Parse(xml)
                .Descendants()
                .FirstOrDefault(e => e.Name == "value")
                .Descendants()
                .Select(e => e.ToString());

            var value = string.Join("\n", elementsAsString);            
            Console.WriteLine(value);

            //规范xml
            xml = @"<Language Key=""lbl_ResponsibleDeclarationDetail"">
<value>
<![CDATA[
<p>福建省地方就看电视剧</p>
<p>福建省地方就看电视剧</p>
<p>福建省地方就看电视剧</p>
]]>
</value>
</Language>";
            var element = XElement.Parse(xml)
                .Descendants()
                .FirstOrDefault(e => e.Name == "value");
            Console.WriteLine(element.Value);
        }
    }
}