C# string declare, convert it to int, float and datetime

1. C# string

The "string" is used to define string variables. It is an alias of "String" and is a reference type. Unlike other data types that have a range and occupy bytes, it can store a series of characters.

2. C# declare string variable

string text = "C# string";

string str,text;//The default value is null

string str = "C#",text = "C# declare string variable";

string filePath = @"G:\xq\test";//There is an escape character \ in the string, add @ in front

string filePath = "G:\\xq\\test";//There is an escape character \ in the string, add \ before the escape character

If the string is very long and one line cannot be displayed, it needs to be displayed on a new line. You can also add @ before the string, refer to string filePath.

C# declare string array:

string[] arr = { "C#", "declare", "string array" };

declare[] arr1 = new string[3]{ "C#", "string", "string array" };

declare[] arr2 = new string[]{ "C#", "string", "string array" };

3. C# string is converted to other data types

A. C# string to int(the converted character requires a number, otherwise an exception may occur)

string num = "200";

int n = int.Parse(num);//When "num" is not a number, an exception occurs

int n = DateTime.ToInt32(num);//When "num" is not a number, an exception is triggered

B. C# string to float

string text = "80";

double d = double.Parse(text);

double d1 = DateTime.ToDouble(text);

The conversion result is 80. If there are non-data characters(such as 80t) in the string, both conversion methods will throw exceptions.

C. C# string to datetime

string date = "08/24/2020";

DateTime dt = DateTime.Parse(date);//When "date" is not a date, an exception occurs

DateTime dt = DateTime.ToDateTime(date);//When "date" is not a date, an exception occurs

Converting to other data types also uses the corresponding methods of Parse() and DateTime. Refer to the above conversion examples and draw inferences.