在 C# 中将字符串转换为类型

Muhammad Zeeshan 2023年10月12日
  1. C# 中获取 String 值的 type
  2. 比较 C# 中的 type 对象
在 C# 中将字符串转换为类型

在这篇文章中,我将解释如何将字符串转换为 type 或在 C# 中获取数据类型。为了确定值类型,我们将使用 .GetType 函数。

C# 中获取 String 值的 type

下面的示例获取字符串的 runtime 类型和其他值,然后继续获取每个值的类型。

创建一个名为 StringtoType 的类和一个 Main() 方法。

class StringtoType {
  public static void Main() {}
}

接下来,创建一个名为 allvaluesObject[] 类型变量,并为其赋予一些值,例如 "Abc"(作为字符串)和 89(作为字节)。

object[] allvalues = { "Abc",
                       (long)193527,
                       "Happy Programming",
                       (byte)89,
                       'Z',
                       (sbyte)-11,
                       "Zeelandia is 8th continent",
                       27.9,
                       "I am a string line",
                       (int)20,
                       '7' };

然后,使用 foreach 循环,验证数组中的每个条目以确定其类型。

foreach (var data in allvalues) {
}

foreach 循环中初始化类型为 Type 的名为 t 的变量。变量 t 将在 data.GetType() 方法的帮助下保存数组 allvalues 中存在的每个值的数据类型。

Type t = data.GetType();

之后,我们将应用 if 条件来检查每个值是否都是字符串。

if (t.Equals(typeof(string)))

如果发现值是字符串,则会显示如下消息。

'Happy Programming' is a String

在将字符串转换为 Type 和其他类型的数据后,如 bytesbyteintdouble 等,借助以下 else if 检查:

else if (t.Equals(typeof(sbyte))) Console.WriteLine(" '{0}' is a Signed Byte", data);
else if (t.Equals(typeof(byte))) Console.WriteLine(" '{0}' is a  Byte", data);
else if (t.Equals(typeof(int))) Console.WriteLine(" '{0}' is an Integer of 32-bit", data);
else if (t.Equals(typeof(long))) Console.WriteLine(" '{0}' is an Integer of 64-bit", data);
else if (t.Equals(typeof(double))) Console.WriteLine("'{0}' is a double ", data);

最后,如果在数组 allvalues 中发现除了 bytesbyteintdoublelong 类型的数据,它将简单地显示如下消息:

'Z' is another type of data

完整代码示例:

using System;
using System.Diagnostics;

class StringtoType {
  public static void Main() {
    object[] allvalues = { "Abc",
                           (long)193527,
                           "Happy Programming",
                           (byte)89,
                           'Z',
                           (sbyte)-11,
                           "Zeelandia is 8th continent",
                           27.9,
                           "I am a string line",
                           (int)20,
                           '7' };

    foreach (var data in allvalues) {
      Type t = data.GetType();
      if (t.Equals(typeof(string)))
        Console.WriteLine(" '{0}' is a String", data);
      else if (t.Equals(typeof(sbyte)))
        Console.WriteLine(" '{0}' is a Signed Byte", data);
      else if (t.Equals(typeof(byte)))
        Console.WriteLine(" '{0}' is a  Byte", data);
      else if (t.Equals(typeof(int)))
        Console.WriteLine(" '{0}' is an Integer of 32-bit", data);
      else if (t.Equals(typeof(long)))
        Console.WriteLine(" '{0}' is an Integer of 64-bit", data);
      else if (t.Equals(typeof(double)))
        Console.WriteLine("'{0}' is a double", data);
      else
        Console.WriteLine("'{0}' is another type of data", data);
    }
  }
}

输出:

 'Abc' is a String
 '193527' is an Integer of 64-bit
 'Happy Programming' is a String
 '89' is a  Byte
'Z' is another type of data
 '-11' is a Signed Byte
 'Zeelandia is 8th continent' is a String
'27.9' is a double
 'I am a string line' is a String
 '20' is an Integer of 32-bit
'7' is another type of data

比较 C# 中的 type 对象

具有类型的 Type 对象是不同的。如果两个 Type 对象标识符表示相同的类型,则它们对应于同一个对象。

它使 Type 对象能够使用引用相等进行比较。下面的示例比较了包含多个整数值的 Type 对象,以查看它们是否属于同一类型。

首先,在 Main() 方法中初始化 intdoublelong 类型的变量,并为它们分配一些值。

int Value1 = 2723;
double Value2 = 123.56;
int Value3 = 1747;
long Value4 = 123456789;

在变量 t 中初始化类型 Type 的变量 t,我们将通过 .GetType 方法存储名为 Value1 的值 1 的数据类型。

Type t = Value1.GetType();

现在,借助 Object.ReferenceEquals(t, Value2.GetType()) 函数,我们将所有对象的类型与 Value1 进行比较。

Console.WriteLine("Data type of Value1 and Value2 are equal: {0}",
                  Object.ReferenceEquals(t, Value2.GetType()));
Console.WriteLine("Data type of Value1 and Value3 are equal: {0}",
                  Object.ReferenceEquals(t, Value3.GetType()));
Console.WriteLine("Data type of Value1 and Value4 are equal: {0}",
                  Object.ReferenceEquals(t, Value4.GetType()));

完整代码示例:

using System;
using System.Diagnostics;

class CompareTypeObjects {
  public static void Main() {
    int Value1 = 2723;
    double Value2 = 123.56;
    int Value3 = 1747;
    long Value4 = 123456789;

    Type t = Value1.GetType();

    Console.WriteLine("The data type of Value1 and Value2 are equal: {0}",
                      Object.ReferenceEquals(t, Value2.GetType()));
    Console.WriteLine("The data type of Value1 and Value3 are equal: {0}",
                      Object.ReferenceEquals(t, Value3.GetType()));
    Console.WriteLine("The data type of Value1 and Value4 are equal: {0}",
                      Object.ReferenceEquals(t, Value4.GetType()));
  }
}

输出:

The data type of Value1 and Value2 are equal: False
The data type of Value1 and Value3 are equal: True
The data type of Value1 and Value4 are equal: False
Muhammad Zeeshan avatar Muhammad Zeeshan avatar

I have been working as a Flutter app developer for a year now. Firebase and SQLite have been crucial in the development of my android apps. I have experience with C#, Windows Form Based C#, C, Java, PHP on WampServer, and HTML/CSS on MYSQL, and I have authored articles on their theory and issue solving. I'm a senior in an undergraduate program for a bachelor's degree in Information Technology.

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