Common data type conversion problems and solutions in C#

Common data type conversion problems and solutions in C

#In C#, data type conversion is a common problem. Since C# is a strongly typed language, the types of variables must match when calculating or assigning values. Therefore, when we need to convert one data type to another data type, we may encounter various problems. This article will introduce common data type conversion problems and provide corresponding solutions and specific code examples.

1. Convert string to integer type

Problem: When we need to convert a string to integer type (int), we may encounter incorrect format String or string is empty.

Solution: You can use the Int32.TryParse() method to solve this problem. This method attempts to convert the string to an integer type, returning true if the conversion is successful and storing the result in an output parameter, or false if the conversion fails.

string str = "123";
int result;

if (Int32.TryParse(str, out result))
{
    Console.WriteLine("转换成功：" + result);
}
else
{
    Console.WriteLine("转换失败");
}

2. Convert floating point number to integer type

Problem: When we need to convert a floating point number to integer type, we may encounter data loss or overflow problems .

Solution: You can use the Math.Round() method to round a floating point number to the nearest integer, and then use the Convert.ToInt32() method to convert it to an integer type.

double num = 3.14;
int result = Convert.ToInt32(Math.Round(num));
Console.WriteLine("转换结果：" + result);

3. Convert integer type to string

Question: When we need to convert an integer type to a string, we can directly use the ToString() method to convert. But in some cases, you may encounter problems with output as is, such as converting the integer 0 to a string.

Solution: You can use the String.Format() or Convert.ToString() method to convert the integer type to a string and specify the formatting parameters.

int num = 0;
string result = String.Format("{0}", num);
Console.WriteLine("转换结果：" + result);

int num = 0;
string result = Convert.ToString(num);
Console.WriteLine("转换结果：" + result);

4. Convert string to date type

Problem: When we need to convert a string to date type, we may encounter an incorrectly formatted string Or the string is empty.

Solution: You can use the DateTime.TryParse() method to solve this problem. This method will attempt to convert the string to a date type, returning true if the conversion is successful and storing the result in an output parameter, or false if the conversion fails.

string str = "2022-01-01";
DateTime result;

if (DateTime.TryParse(str, out result))
{
    Console.WriteLine("转换成功：" + result);
}
else
{
    Console.WriteLine("转换失败");
}

5. Convert string to enumeration type

Problem: When we need to convert a string to an enumeration type, we may encounter that the string does not exist Or problems that are not within the scope of the enumeration.

Solution: You can use the Enum.TryParse() method to solve this problem. This method attempts to convert the string to an enumeration type, returning true if the conversion is successful and storing the result in an output parameter, or false if the conversion fails.

string str = "Monday";
DayOfWeek result;

if (Enum.TryParse(str, out result))
{
    Console.WriteLine("转换成功：" + result);
}
else
{
    Console.WriteLine("转换失败");
}

Summary:

Data type conversion in C# is a common problem. This article describes common data type conversion problems and provides corresponding solutions and specific code examples. By mastering these conversion skills, we can handle conversions between different data types more flexibly, improving the readability and robustness of the code.

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