C# |检查字符串是否包含特定值

原文:https://www . geesforgeks . org/c-sharp-check-if-the-stringdictionary-contains-a-specific-value/

StringDictionary。ContainsValue(String) 方法用于检查 StringDictionary 是否包含特定值。

语法:

public virtual bool ContainsValue (string value);

这里， 值 是字符串中要定位的值。该值可以为空。

返回值:如果 StringDictionary 包含指定值的元素，则返回 true ，否则返回 false 。

下面的程序说明了字符串的使用。ContainsValue(String) 方法:

例 1:

// C# code to check if the
// StringDictionary contains
// a specific value
using System;
using System.Collections;
using System.Collections.Specialized;

class GFG {

// Driver code
public static void Main()
{

    // Creating a StringDictionary named myDict
    StringDictionary myDict = new StringDictionary();

    // Adding key and value into the StringDictionary
    myDict.Add("G", "Geeks");
    myDict.Add("F", "For");
    myDict.Add("C", "C++");
    myDict.Add("DS", "Data Structures");
    myDict.Add("N", "Noida");

    // Checking if "C++" is contained in
    // StringDictionary myDict
    if (myDict.ContainsValue("C++"))
        Console.WriteLine("StringDictionary myDict contains the value");
    else
        Console.WriteLine("StringDictionary myDict does not contain the value");
    }
}

Output:

StringDictionary myDict contains the value

例 2:

// C# code to check if the
// StringDictionary contains
// a specific value
using System;
using System.Collections;
using System.Collections.Specialized;

class GFG {

// Driver code
public static void Main()
{

    // Creating a StringDictionary named myDict
    StringDictionary myDict = new StringDictionary();

    // Adding key and value into the StringDictionary
    myDict.Add("G", "Geeks");
    myDict.Add("F", "For");
    myDict.Add("C", "C++");
    myDict.Add("DS", "Data Structures");
    myDict.Add("N", "Noida");

    // Checking if "null" is contained in
    // StringDictionary myDict
    // It should not raise any exception
    if (myDict.ContainsValue(null))
        Console.WriteLine("StringDictionary myDict contains the value");
    else
        Console.WriteLine("StringDictionary myDict does not contain the value");
    }
}

Output:

StringDictionary myDict does not contain the value

注:

参考:

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