Check if a Windows ListBox contains a string c# ignorecase?

This question already has an answer here: Case insensitive 'Contains(string)' 22 answers Case-Insensitive List Search 6 answers 如果您的lstFieldData只包含大写字母或小写字母,则可以使用.ToUpper()或.ToLower()。 lstFieldData A B C D if (!lstFieldData.Items.Contains(ItemValue.ToUpper())) MessageBox.Show(ItemValue + "Item not found."); lstFieldData a b

检查Windows ListBox是否包含字符串c#ignorecase?

这个问题在这里已经有了答案: 不区分大小写'包含(字符串)'22个答案 不区分大小写的列表搜索6个答案 如果您的lstFieldData只包含大写字母或小写字母,则可以使用.ToUpper()或.ToLower()。 lstFieldData A B C D if (!lstFieldData.Items.Contains(ItemValue.ToUpper())) MessageBox.Show(ItemValue + "Item not found."); lstFieldData a b c d if (!lstFieldData.Items

c# If else statement with case insensative

This question already has an answer here: Case insensitive 'Contains(string)' 22 answers 尝试这个if(article.IndexOf(value, StringComparison.OrdinalIgnoreCase) >= 0) { // .... } else { // ..... }

c#If else语句不区分大小写

这个问题在这里已经有了答案: 不区分大小写'包含(字符串)'22个答案 尝试这个if(article.IndexOf(value, StringComparison.OrdinalIgnoreCase) >= 0) { // .... } else { // ..... }

C# Case insensitive string comparison

This question already has an answer here: Case insensitive 'Contains(string)' 22 answers How to ignore the case sensitivity in List<string> 11 answers The Contains method has an overload that accepts an IEqualityComparer . You can give it one by doing the following: if (list.Contains(test2, StringComparer.OrdinalIgnoreCase)) { // do something } IndexOf has a p

C#不区分大小写的字符串比较

这个问题在这里已经有了答案: 不区分大小写'包含(字符串)'22个答案 如何忽略List <string>中11个答案的区分大小写 Contains方法有一个接受IEqualityComparer的重载。 您可以通过执行以下操作来完成一项操作: if (list.Contains(test2, StringComparer.OrdinalIgnoreCase)) { // do something } IndexOf有一个用于不区分大小写搜索的参数 culture.CompareInfo.IndexOf(toSearch, word,

Insensitive StringA.Contains(StringB)?

This question already has an answer here: Case insensitive 'Contains(string)' 22 answers Case Insensitive comparison in C# [duplicate] 7 answers You can convert both strings to upper case before performing the check: string1.ToUpperInvariant().Contains(string2.ToUpperInvariant()) Or if you want to take the current culture into account when defining case insesitivity: string1.ToUp

不敏感的StringA.Contains(StringB)?

这个问题在这里已经有了答案: 不区分大小写'包含(字符串)'22个答案 在C#中不区分大小写的比较[复制] 7个回答 在执行检查之前,您可以将这两个字符串转换为大写字母: string1.ToUpperInvariant().Contains(string2.ToUpperInvariant()) 或者,如果您想在定义案例可检测性时考虑当前的文化: string1.ToUpper().Contains(string2.ToUpper()) 或者你甚至可以通过调用接受CultureInfo的ToUpper重载来使用特定

Case Insensitive comparison in C#

This question already has an answer here: Case insensitive 'Contains(string)' 22 answers string.Equals("this will return true", "ThIs WiLL ReTurN TRue", StringComparison.CurrentCultureIgnoreCase) 或者,包含 if (string1.IndexOf(string2, StringComparison.CurrentCultureIgnoreCase) >= 0) I prefer an extension method like this. public static class StringExtensions

在C#中不区分大小写的比较

这个问题在这里已经有了答案: 不区分大小写'包含(字符串)'22个答案 string.Equals("this will return true", "ThIs WiLL ReTurN TRue", StringComparison.CurrentCultureIgnoreCase) 或者,包含 if (string1.IndexOf(string2, StringComparison.CurrentCultureIgnoreCase) >= 0) 我更喜欢这样的扩展方法。 public static class StringExtensions { public static bool Contains(thi

Find a substring in a case

Possible Duplicate: Case insensitive contains(string) With Contains() method of String class a substring can be found. How to find a substring in a string in a case-insensitive manner? You can use the IndexOf() method, which takes in a StringComparison type: string s = "foobarbaz"; int index = s.IndexOf("BAR", StringComparison.CurrentCultureIgnoreCase); // index = 3 If the string was not

在案例中查找一个子字符串

可能重复: 不区分大小写包含(字符串) 使用Contains()方法的String类可以找到一个子字符串。 如何以不区分大小写的方式在字符串中查找子字符串? 您可以使用IndexOf()方法,该方法采用StringComparison类型: string s = "foobarbaz"; int index = s.IndexOf("BAR", StringComparison.CurrentCultureIgnoreCase); // index = 3 如果找不到字符串,IndexOf()返回-1。 没有不区分大小写的版本。 使用替代的索引

How to make String.Contains case insensitive?

This question already has an answer here: Case insensitive 'Contains(string)' 22 answers You can create your own extension method to do this: public static bool Contains(this string source, string toCheck, StringComparison comp) { return source != null && toCheck != null && source.IndexOf(toCheck, comp) >= 0; } And then call: mystring.Contains(myStringTo

如何使String.Contains不区分大小写?

这个问题在这里已经有了答案: 不区分大小写'包含(字符串)'22个答案 您可以创建自己的扩展方法来执行此操作: public static bool Contains(this string source, string toCheck, StringComparison comp) { return source != null && toCheck != null && source.IndexOf(toCheck, comp) >= 0; } 然后打电话给: mystring.Contains(myStringToCheck, StringComparison.OrdinalIgnore

C# Exclamation Operator On Object

In c# what do the following code fragments do? 1) if (!object) { //code } 2) if (object) { //code } Where object is an instance of a class, and definately not bool. 1) In java, trying the above code will make the compiler issue an error. Only boolean variables can be used as a Condition_Block. This works as expected. 2) In c++, if(!object){...} is used for null checks. 3) In c#,

对象上的C#感叹号操作符

在c#中以下代码片段做了什么? 1) if (!object) { //code } 2) if (object) { //code } 哪里的对象是一个类的实例,肯定不是布尔。 1)在java中,尝试上面的代码会使编译器发出错误。 只有布尔变量可以用作Condition_Block。 这按预期工作。 2)在c ++中,如果(!object){...}用于空检查。 3)在C#中,编译器不会发生错误,并且很乐意编译它。 Google从未提及!运算符用于对象。 它只给出bool值的搜索

Null conditional operator to "nullify" array element existence

The new C# 6.0 null-conditional operator is a handy vehicle for writing more concise and less convoluted code. Assuming one has an array of customers, then you could get null instead of a length if customers is null using this (examples from MSDN): int? length = customers?.Length; Similarly you could get null instead of a customer with this: Customer first = customers?[0]; And for a more ela

空条件运算符“取消”数组元素的存在

新的C#6.0空条件运算符是一种用于编写更简洁,不太复杂的代码的便捷工具。 假设有一个客户数组,那么如果customers使用此值(MSDN中的示例)为null,那么您可以得到null而不是长度: int? length = customers?.Length; 同样,你可以用null来代替客户: Customer first = customers?[0]; 而对于更精细的表达式,如果customers为空,第一个客户为空或第一个客户的Orders对象为空,则此值为空: int? count = customers?[0]?.

Is there any performance gain when using features from C# 6.0?

Do C# 6.0 features (like expression-bodied method-like members, using static , null-conditional operator or string interpolation) have any impact on the performance of a program or at least the compiling time? I like the new features but I was asking myself when using them if there is any performance gain/issue. Not really. The new features are merely syntactic sugar for things already possib

在使用C#6.0的功能时会有性能提升吗?

C#6.0的特性(如类似于表达式方法类成员, using static ,空条件运算符还是字符串插值)对程序性能或至少编译时间有什么影响? 我喜欢这些新功能,但如果有任何性能增益/问题,我在使用它们时会问自己。 不是真的。 新功能仅仅是C#中已经可以实现的语法糖。 由新功能生成的代码(如空传播运算符)最终会产生与以前相同的C#代码。 它的确会让你的表现更好,可能代码质量会更好,这是一件好事。