Question

我需要在导出到excel时将datagridview列更改为整数。 column1具有整数值。

myTable.Rows[i].Cells["column1"].Value.ToString();



string[,] ID = new string[myTable.RowCount, 1];
                for (int i = 0; i < myTable.RowCount; i++)
                {
                   ID[i, 0] = myTable.Rows[i].Cells["column1"].Value.ToString();
                }

Answer 1

您可以使用int.TryParse方法执行从string到integer的安全转换：

int value;
string input = myTable.Rows[i].Cells["column1"].Value.ToString();
if(int.TryParse(input, out value))
{
    ...
}

如果您的值无法解析为整数，则TryParse将返回false。

Answer 2

使用此：

Convert.ToInt32（string s）

Converts the specified string representation of 
32-bit signed integer equivalent. This calls in turn Int32.Parse () method. 
When s is a null reference, it will return 0 rather than throw ArgumentNullException.

示例：

int num=Convert.ToInt32(myTable.Rows[i].Cells["column1"].Value.ToString());

Int32.Parse（string s）

Converts the string representation of a number to its 32-bit signed integer equivalent. 
When s is a null reference, it will throw ArgumentNullException.

示例：

int num=int.Parse(myTable.Rows[i].Cells["column1"].Value.ToString());

Int32.Parse（string，out int）

Converts the specified string representation of 32-bit signed integer equivalent 
to out variable, and returns true if it is parsed successfully, false otherwise.

示例：

string str=myTable.Rows[i].Cells["column1"].Value.ToString();
if(Int32.TryParse(str, out result)
{
    //code
}

Answer 3

尝试通过Int32.TryParse（Details in MSDN）

进行转换

//method
public static bool TryParse(
        string s,
        out int result
)

//How to use:
int number;
bool res = Int32.TryParse(myTable.Rows[i].Cells["column1"].Value.ToString(), out number);

//if parse was successfull
if(res)
{
  //export to Excel
}
else
{
  //throw exception, value was not an int
}

如何将datagridview列更改为int

3 个答案: