如何将组合框的选定值转换为整数？

Question

我有一个由数据源填充的组合框(值和id)

comboBox_Degree.DataSource = ds.Tables["Field"];`
comboBox_Degree.DisplayMember = "Field_Degree";
comboBox_Degree.ValueMember = "Field_ID";

现在我想在SelectedIndexChanged事件发生时检索id.但是当我把它转换为int时,我有这样的错误.

int fid = Convert.ToInt32(comboBox_Degree.SelectedValue.ToString());

错误:

输入字符串的格式不正确.

如何将此值转换为整数？

Answer 1

用这个:

int fid;
bool parseOK = Int32.TryParse(comboBox_Degree.SelectedValue.ToString(), out fid);

Answer 2

我经常这样做

int fid=0;
try {
     fid=int.Parse(comboBox_Degree.SelectedValue.ToString());
    } catch (Exception e)
    {
     //Whatever you want to do when it is not an int
    }