使用Linq将IEnumerable <KeyValuePair <string,string >>值连接成字符串

Question

鉴于IEnumerable<KeyValuePair<string,string>>,我正在尝试使用linq将值连接成一个字符串.

我的尝试:

string path = attributes.Aggregate((current, next) => "@" + current.Key + "=" + current.Value + " and @" + next.Key + "=" + next.Value);

这会产生错误:

无法将表达式' string' 转换为返回类型' KeyValuePair<string,string>'

在linq中有更有效的方法吗？

完整的方法......

public IEnumerable<XmlNode> GetNodes(IEnumerable<KeyValuePair<string,string>> attributes) {
    StateInfoXmlDocument stateInfoXmlDocument = new StateInfoXmlDocument();
    string path = attributes.Aggregate((current, next) => "@" + current.Key + "=" + current.Value + " and @" + next.Key + "=" + next.Value);
    string schoolTypeXmlPath = string.Format(SCHOOL_TYPE_XML_PATH, path);

    return stateInfoXmlDocument.SelectNodes(schoolTypeXmlPath).Cast<XmlNode>().Distinct();
}

Answer 1

这是你在找什么？

var strings = attributes.Select(kvp => string.Format("@{0}={1}", kvp.Key, kvp.Value));
string path = string.Join(" and ", strings);