学用 ASP.Net 之 "字符串" (3): string 类的非扩展方法

string 类的非扩展成员:

/* 类方法 */string.Compare;            //对比, 返回 1、0 或 -1string.CompareOrdinal;     //对比, 返回序号差string.Concat;             //合并string.Copy;               //复制string.Equals;             //是否同值string.Format;             //格式化输出string.Intern;             //string.IsInterned;         //string.IsNullOrEmpty;      //是否是 null 或 Emptystring.IsNullOrWhiteSpace; //是否是 null 或 Empty 或空白字符string.Join;               //连接string.ReferenceEquals;    //是否是相同的实例, 继承自 Object/* 变量 */string.Empty; // 空字符串, 同 ""/* 属性 */Length;       ///* 对象方法 */Clone;            //引用CompareTo;        //Contains;         //是否包含CopyTo;           //复制部分到字符数组EndsWith;         //尾匹配Equals;           //是否同值GetEnumerator;    //获取枚举器GetHashCode;      //GetType;          //GetTypeCode;      //IndexOf;          //查找IndexOfAny;       //根据字符数组查找Insert;           //插入IsNormalized;     //LastIndexOf;      //从右边开始查找LastIndexOfAny;   //根据字符数组从右边开始查找Normalize;        //PadLeft;          //从左边添加空格或其它字符PadRight;         //从右边添加空格或其它字符Remove;           //移除Replace;          //替换Split;            //分割StartsWith;       //首匹配Substring;        //截取ToLower;          //转小写ToLowerInvariant; //转小写, 使用区域大小写规则ToString;         //ToUpper;          //转大写ToUpperInvariant; //转大写, 使用区域大小写规则Trim;             //删左右空白TrimEnd;          //删右空白TrimStart;        //删左空白

大小写转换:

protected void Button1_Click(object sender, EventArgs e){    TextBox1.TextMode = TextBoxMode.MultiLine;    string str = "Asp.Net", s1, s2, s3, s4;    s1 = str.ToUpper();          //ASP.NET    s2 = str.ToUpperInvariant(); //ASP.NET    s3 = str.ToLower();          //asp.net    s4 = str.ToLowerInvariant(); //asp.net    TextBox1.Text = string.Concat(s1 + "\n" + s2 + "\n" + s3 + "\n" + s4);}

添加或删除空白:

protected void Button1_Click(object sender, EventArgs e){    string str, s1, s2, s3, s4, s5, s6, s7, r = "\n";    str = "Asp";    s1 = '>' + str.PadLeft(str.Length + 4) + '<';  //>    Asp<    s2 = '>' + str.PadRight(str.Length + 4) + '<'; //>Asp    <    s3 = '>' + str.PadLeft(7, '*') + '<';          //>****Asp<    s4 = '>' + str.PadRight(7, '*') + '<';         //>Asp****<    str = "    Asp    ";    s5 = '>' + str.TrimStart() + '<'; //>Asp    <    s6 = '>' + str.TrimEnd() + '<';   //>    Asp<    s7 = '>' + str.Trim() + '<';      //>Asp<    TextBox1.Text = string.Concat(s1 + r + s2 + r + s3 + r + s4 + r + s5 + r + s6 + r + s7);}

截取:

protected void Button1_Click(object sender, EventArgs e){    string str, s1, s2, r = "\n";    str = "123456789";    s1 = str.Substring(2);    //3456789    s2 = str.Substring(2, 4); //3456    TextBox1.Text = string.Concat(s1 + r + s2);}

分割:

protected void Button1_Click(object sender, EventArgs e){    string str, r = "\n";    str = "1:2-3|4:5-6||7:8-9";    string[] arr1 = str.Split('|');    TextBox1.Text += string.Join(" / ", arr1) + r; //1:2-3 / 4:5-6 /  / 7:8-9 /    string[] arr2 = str.Split('|', ':');    TextBox1.Text += string.Join(" / ", arr2) + r; //1 / 2-3 / 4 / 5-6 /  / 7 / 8-9 /     string[] arr3 = str.Split('|', ':', '-');    TextBox1.Text += string.Join(" / ", arr3) + r; //1 / 2 / 3 / 4 / 5 / 6 /  / 7 / 8 / 9 /     string[] arr4 = str.Split(new char[] { '|', ':', '-' });    TextBox1.Text += string.Join(" / ", arr4) + r; //1 / 2 / 3 / 4 / 5 / 6 /  / 7 / 8 / 9 /     char[] cs = { '|', ':', '-' };    string[] arr5 = str.Split(cs);    TextBox1.Text += string.Join(" / ", arr5) + r; //1 / 2 / 3 / 4 / 5 / 6 /  / 7 / 8 / 9 /     string[] arr6 = str.Split(cs, 3);    TextBox1.Text += string.Join(" / ", arr6) + r; //1 / 2 / 3|4:5-6||7:8-9 /     string[] arr7 = str.Split(cs, StringSplitOptions.RemoveEmptyEntries);    TextBox1.Text += string.Join(" / ", arr7) + r; //1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 /     string[] arr8 = str.Split(cs, int.MaxValue, StringSplitOptions.RemoveEmptyEntries);    TextBox1.Text += string.Join(" / ", arr8) + r; //1 / 2 / 3 / 4 / 5 / 6 / 7 / 8 / 9 /     string[] arr9 = str.Split(new char[] { '|' }, StringSplitOptions.RemoveEmptyEntries);    TextBox1.Text += string.Join(" / ", arr9) + r; //1:2-3 / 4:5-6 / 7:8-9 / }

替换:

protected void Button1_Click(object sender, EventArgs e){    string str, r = "\n", s1, s2;    str = "Asp.Net 3.5";    s1 = str.Replace('.', '-');     //Asp-Net 3-5    s2 = str.Replace("3.5", "4.0"); //Asp.Net 4.0    TextBox1.Text = string.Concat(s1, r, s2);}

插入与移除:

protected void Button1_Click(object sender, EventArgs e){    string str, r = "\n", s1, s2, s3;    str = "Asp 3.5";    s1 = str.Insert(3, ".Net"); //Asp.Net 3.5    s2 = str.Remove(3);         //Asp    s3 = str.Remove(0, 4);      //3.5    TextBox1.Text = string.Concat(s1, r, s2, r, s3);}

查找:

protected void Button1_Click(object sender, EventArgs e){    string str = "Asp.Net 3.5";    int n1, n2, n3, n4, n5, n6, n7;    n1 = str.IndexOf('.');     //3    n2 = str.LastIndexOf('.'); //9    n3 = str.IndexOf('.', 4);  //9    n4 = str.IndexOf("NET");   //-1    n5 = str.IndexOf("NET", StringComparison.CurrentCultureIgnoreCase); //4    n6 = str.IndexOfAny(new char[] {'3', '5'});       //8    n7 = str.LastIndexOfAny(new char[] { '3', '5' }); //10    TextBox1.Text = string.Format("{0}\n{1}\n{2}\n{3}\n{4}\n{5}\n{6}", n1, n2, n3, n4, n5, n6, n7);}

是否包含:

protected void Button1_Click(object sender, EventArgs e){    string str = "Asp.Net 3.5";    bool b1, b2, b3;    b1 = str.Contains('S');   //False    b2 = str.Contains('s');   //True    b3 = str.Contains("Net"); //True    TextBox1.Text = string.Format("{0}\n{1}\n{2}", b1, b2, b3);}

首尾匹配:

protected void Button1_Click(object sender, EventArgs e){    string str = "Asp.Net 3.5";    bool b1, b2, b3, b4;    b1 = str.StartsWith("asp");             //False    b2 = str.StartsWith("asp", StringComparison.CurrentCultureIgnoreCase); //True    b3 = str.StartsWith("asp", true, null); //True    b4 = str.EndsWith("5");                 //True    TextBox1.Text = string.Format("{0}\n{1}\n{2}\n{3}", b1, b2, b3, b4);}

对比:

protected void Button1_Click(object sender, EventArgs e){    string str1 = "1001ABC";    string str2 = "1001abc";    int n1, n2, n3, n4, n5, n6, n7, n8, n9, n0;    n1 = str1.CompareTo(str2); // 1    n2 = str2.CompareTo(str1); //-1    n3 = str1.CompareTo(str1); // 0    n4 = string.Compare(str1, str2);          // 1    n5 = string.Compare(str2, str1);          //-1    n6 = string.Compare(str1, str2, true);    // 0    n7 = string.Compare(str1, 0, str2, 0, 4); // 0    n8 = string.CompareOrdinal(str1, str2);          //-32    n9 = string.CompareOrdinal(str2, str1);          // 32    n0 = string.CompareOrdinal(str1, 0, str2, 0, 4); // 0    TextBox1.Text = string.Format("{0}\n{1}\n{2}\n{3}\n{4}\n{5}\n{6}\n{7}\n{8}\n{9}", n1, n2, n3, n4, n5, n6, n7, n8, n9, n0);}

是否相同:

protected void Button1_Click(object sender, EventArgs e){    string str1 = "Asp.Net", str2 = "ASP.NET";    bool b1, b2, b3, b4, b5, b6, b7;    b1 = string.Equals(str1, str2);          //False    b2 = string.Equals(str1, str2, StringComparison.CurrentCultureIgnoreCase); //True    b3 = str1.Equals(str2);                  //False    b4 = str1.Equals(str2, StringComparison.CurrentCultureIgnoreCase);         //True    string str3 = str1;    b5 = string.ReferenceEquals(str1, str3); //True    str1 = str1.ToLower();    str2 = str2.ToLower();    b6 = str1 == str2;                       //True    b7 = string.ReferenceEquals(str1, str2); //False    TextBox1.Text = string.Format("{0}\n{1}\n{2}\n{3}\n{4}\n{5}\n{6}", b1, b2, b3, b4, b5, b6, b7);}

复制与引用:

protected void Button1_Click(object sender, EventArgs e){    string str1 = "abc";    string str2 = string.Copy(str1);    string str3 = (string)str1.Clone();    bool b1 = string.ReferenceEquals(str1, str2); //False    bool b2 = string.ReferenceEquals(str1, str3); //True    TextBox1.Text = string.Format("{0}\n{1}", b1, b2);}

复制部分到字符数组:

protected void Button1_Click(object sender, EventArgs e){    char[] cs = { '1', '2', '3', '4', '5', '6', '7', '8', '9' };    string str = "ABCDEFG";    str.CopyTo(1, cs, 3, 2);    TextBox1.Text = string.Join("", cs); // 123BC6789}

是否为空:

protected void Button1_Click(object sender, EventArgs e){    bool b1, b2, b3, b4, b5;    b1 = string.IsNullOrEmpty(null);         //True    b2 = string.IsNullOrEmpty(string.Empty); //True    b3 = string.IsNullOrEmpty("");           //True    b4 = string.IsNullOrWhiteSpace("   ");   //True    b5 = string.IsNullOrWhiteSpace("123");   //False    TextBox1.Text = string.Format("{0}\n{1}\n{2}\n{3}\n{4}", b1, b2, b3, b4, b5);}

枚举器:

protected void Button1_Click(object sender, EventArgs e){    // 需 using System.Collections;    string str = "Asp.Net 3.5";    IEnumerator Enum = str.GetEnumerator();    while (Enum.MoveNext())     {        TextBox1.Text += string.Format("{0}|", Enum.Current); //A|s|p|.|N|e|t| |3|.|5|    }}

连接与串联:

protected void Button1_Click(object sender, EventArgs e){    string str;    str = string.Concat("Asp", '.', "Net", "\x20", 3, '.', 5); //Asp.Net 3.5    TextBox1.Text += str + "\n";    int[] nArr = { 1, 3, 2, 4, 3, 5 };    str = string.Join("*", nArr); //1*3*2*4*3*5    TextBox1.Text += str + "\n";    str = "Asp.Net";    str = string.Join("|", str.ToArray()); //A|s|p|.|N|e|t    TextBox1.Text += str + "\n";    string[] sArr = { "one", "two", "three", "four", "five", "six", "seven", "eight", "nine", "ten" };    str = string.Join("; ", sArr, 1, 3);   //two; three; four    TextBox1.Text += str + "\n"; }

学用 ASP.Net 之 "字符串" (3): string 类的非扩展方法

学用 ASP.Net 之 "字符串" (3): string 类的非扩展方法

更多相关文章

随机推荐