C# | Convert。今日时间(字符串，表单提供者)方法

原文:https://www . geesforgeks . org/c-sharp-convert-todaytetimestring-iformat provider-method/

此方法用于使用指定的区域性特定格式信息，将数字的指定字符串表示形式转换为等效的日期和时间。 语法:

public static DateTime ToDateTime (string value, IFormatProvider provider);

参数:

  • 值:包含要转换的日期和时间的字符串。
  • 提供程序:提供区域性特定格式信息的对象。

返回值:此方法返回值的日期时间等价物，如果值为空，则返回民值的日期时间等价物。 异常:如果值不是格式正确的日期和时间字符串，此方法将给出格式异常。 以下程序说明了转换的使用。今日时间(字符串，表单提供者)方法 示例 1:

c sharp . c sharp . c sharp . c sharp

// C# program to demonstrate the
// Convert.ToDateTime() Method
using System;
using System.Globalization;

class GFG {

// Main Method
public static void Main()
{
    try {

        // creating object of CultureInfo
        CultureInfo cultures = new CultureInfo("en-US");

        // declaring and initializing String array
        string[] values = {"01/02/09", "2009/02/03",
            "01/2009/03", "01/02/2009", "01/02/23"};

        // calling get() Method
        Console.WriteLine("Converted string value"+
                       " to specified DateTime: ");

        for (int j = 0; j < values.Length; j++) {

            get(values[j], cultures);
        }
    }

    catch (FormatException e) {

        Console.WriteLine("\n");
        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
}

// Defining get() method
public static void get(string s,
           CultureInfo cultures)
{

    // converting string to specified bool
    DateTime val = Convert.ToDateTime(s, cultures);

    // display the converted string
    Console.Write(" {0}, ", val);
}
}

Output:Converted string value to specified DateTime: 01/02/2009 00:00:00, 02/03/2009 00:00:00, 01/03/2009 00:00:00, 01/02/2009 00:00:00, 01/02/2023 00:00:00,  

例 2: 为格式异常

c sharp . c sharp . c sharp . c sharp

// C# program to demonstrate the
// Convert.ToDateTime() Method
using System;
using System.Globalization;
class GFG {

// Main Method
public static void Main()
{
    try {

        // creating object of CultureInfo
        CultureInfo cultures = new CultureInfo("en-US");

        // declaring and initializing String array
        string[] values = {"01/02/09", "2009/02/03",
            "01/2009/03", "01/02/2009", "01/02/23"};

        // calling get() Method
        Console.WriteLine("Converted string value "+
                         "to specified DateTime: ");

        for (int j = 0; j < values.Length; j++) {

            get(values[j], cultures);
        }
        Console.WriteLine("\n\nvalue is not a properly "+
                      "formatted date and time string.");

        // converting string to specified bool
        DateTime val = Convert.ToDateTime("21/2009/03",
                                             cultures);

        // display the converted string
        Console.Write(" {0}, ", val);
    }
    catch (FormatException e) {
        Console.Write("Exception Thrown: ");
        Console.Write("{0}", e.GetType(), e.Message);
    }
}
// Defining get() method
public static void get(string s,
           CultureInfo cultures)
{

    // converting string to specified bool
    DateTime val = Convert.ToDateTime(s, cultures);

    // display the converted string
    Console.Write(" {0}, ", val);
}
}

Output:Converted string value to specified DateTime: 01/02/2009 00:00:00, 02/03/2009 00:00:00, 01/03/2009 00:00:00, 01/02/2009 00:00:00, 01/02/2023 00:00:00, value is not a properly formatted date and time string. Exception Thrown: System.FormatException  

参考:

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