本类位于System.Data.dll中，名为：System.Data.Common.NameValuePair。主要用途是在DBConnectionString类中，解析ConnectionString时存储并串联Name/Value对。框架类中没有使用Collection名称空间下的通用集合类，应该是出于效率和便于持久化方面的考虑。
[Serializable]public sealed class NameValuePair
{
private readonly string _name; private NameValuePair _next; private readonly string _value; public NameValuePair(string name, string value)
{ if ( StringHelper.IsEmpty(name) ) { throw new ArgumentException("name");
} this._name = name; this._value = value; } public NameValuePair(string name, string value, NameValuePair next) : this(name, value) { this._next = next; } public NameValuePair Clone() { return new NameValuePair(this._name, this._value); } public string Name { get { return this._name; } } public NameValuePair Next { get { return this._next; } set { if ( this._next != null ) { throw new InvalidOperationException(); } this._next = value; } } public string Value { get { return this._value; } }
}原文：http://www.cnblogs.com/Look_Sun/p/4459526.html