QueryBuilder: A Simple Way to Read and Write Query Strings

- 日理万妓 2022-08-07 00:27 154阅读 0赞

# QueryBuilder: A Simple Way to Read and Write Query Strings #

[http://www.codeproject.com/Articles/875164/QueryBuilder-A-Simple-Way-to-Read-and-Write-Query][http_www.codeproject.com_Articles_875164_QueryBuilder-A-Simple-Way-to-Read-and-Write-Query]

代码下载地址：[http://pan.baidu.com/s/1ntuWEpV][http_pan.baidu.com_s_1ntuWEpV]

namespace TestApplication.Query
    {
        public class QueryParameter
        {
            public string Name { get; set; }
            public string Value { get; set; }
            internal bool IsFirst { get; set; }
    
            public QueryParameter(string name, string value)
            {
                this.Name = name;
                this.Value = value;
            }
    
            public QueryParameter(string name)
                : this(name, "")
            { }
    
            public static QueryParameter Create(string parameter)
            {
                string trimmed = parameter.Replace("&", "").Replace("?", "");
                if (trimmed.Contains("="))
                {
                    string[] split = trimmed.Split('=');
                    return new QueryParameter(split[0], split[1]);
                }
                return new QueryParameter(trimmed);
            }
    
            private string Flatten()
            {
                return (this.IsFirst ? '?' : '&') + this.Name +
                       (string.IsNullOrEmpty(this.Value) ? "" : "=") + this.Value;
            }
    
            public override string ToString() { return this.Flatten(); }
    
            //...
    
        }
    }

using System.Collections.Generic;
    using System.Linq;
    
    namespace TestApplication.Query
    {
        public class QueryBuilder
        {
            private List<QueryParameter> _parameters;
            public QueryBuilder()
            {
                _parameters = new List<QueryParameter>();
            }
    
            public QueryParameter this[int index]
            {
                get { return _parameters[index]; }
            }
    
            public string this[string name]
            {
                get
                {
                    return HasParameter(name) ?
                        _parameters.Find(x => x.Name == name).Value : null;
                }
            }
    
            public bool HasParameter(string name)
            {
                return _parameters.Exists(p => p.Name == name);
            }
    
            #region method
    
            public void AddParameter(QueryParameter parameter)
            {
                _parameters.Add(parameter);
                _parameters.Last().IsFirst = (_parameters.Count == 1);
            }
            public void AddParameter(string name, string value)
            {
                AddParameter(new QueryParameter(name, value));
            }
            public void RemoveParameter(QueryParameter parameter)
            {
                _parameters.Remove(parameter);
            }
            public void RemoveParameter(string name)
            {
                QueryParameter param = _parameters.Find(x => x.Name == name);
                _parameters.Remove(param);
            }
    
            public static QueryBuilder Create(string queryString)
            {
                QueryBuilder toReturn = new QueryBuilder();
                if (queryString.Contains('&'))
                {
                    string[] arr = queryString.Split('&');
                    foreach (string p in arr)
                    {
                        toReturn.AddParameter(QueryParameter.Create(p));
                    }
                }
                else
                {
                    toReturn.AddParameter(QueryParameter.Create(queryString));
                }
                return toReturn;
            }
            private string CompileQueryString()
            {
                string toReturn = "";
                foreach (QueryParameter p in _parameters)
                {
                    toReturn += p.ToString();
                }
                return toReturn;
            }
    
            public override string ToString() { return CompileQueryString(); }
    
            #endregion
    
            //...
    
        }
    }

//测试下

class Program
        {
            static void Main(string[] args)
            {
                Query.QueryBuilder querybuilder = new Query.QueryBuilder();
                querybuilder.AddParameter("name", "jon");
                querybuilder.AddParameter("bb", "123");
                querybuilder.AddParameter("aa", "mike");
                querybuilder.AddParameter("cc", "hello");
                Console.WriteLine(querybuilder.ToString());
                Console.ReadKey();
            }
    
            //..
    
        }

?name=jon&bb=123&aa=mike&cc=hello

[http_www.codeproject.com_Articles_875164_QueryBuilder-A-Simple-Way-to-Read-and-Write-Query]: http://www.codeproject.com/Articles/875164/QueryBuilder-A-Simple-Way-to-Read-and-Write-Query
[http_pan.baidu.com_s_1ntuWEpV]: http://pan.baidu.com/s/1ntuWEpV