如何将此列值转换为整数？

Question

My C# code looks like this:

myNum = dt.Columns[0];

myNum is an integer and dt is a datatable. The value in column 0 of dt is a string ("12"), but I'd like to convert it to an integer. How can I do this? I've tried:

myNum = int.Parse(dt.Columns[0]);

...but that doesn't work. Any ideas?

Answer 1

The values are stored in rows and not columns. Try this instead:

myNum = int.Parse(dt.Rows[0][0].ToString());

Answer 2

Your parse wasn't working because the parse method takes a string, and the data comes back as a simple object.

Also, the data is in the rows, so you have two options really, (I prefer the first):

// This converts the object directly to an integer
myNum = Convert.ToInt32(dt.Rows[0][0]); 

// This converts the object to a string, and then parses it into an integer
myNum = int.Parse(dt.Rows[0][0].ToString()); 

Answer 3

if Parse throws an exception, this means dt.Columns[0] is not a valid input. If you want to avoid exception, you can use int.TryParse which returns a boolean telling if the conversion was done or not successfully

EDIT : BTW, Darin must be right: your value is not stored in a column but in a cell

Answer 4

Use TryParse method to parse the Value :

int myNum = 0;
int.TryParse(dt.rows[0][0].ToString() , out myNum);

with above code , If an error occurs , The value of variable will be zero

Answer 5

Convert.ToInt32(dt.Rows[0][0])

如果你正在处理各种类型，例如双打（1.0），上面会更好。