c# - 如何在 Linq 查询中比较字符串

Question

CompareTo 在这里对我不起作用。

我的 linq 查询是

var result = from c in customers 
             where c.CustomerID.CompareTo(txtSerchId.Text) >= 0 
             select` c;

他们得到一个异常(exception)

//////异常///////////

System.ArgumentException was caught
Message=Value does not fall within the expected range.

我的代码是这样的

var result = 
    from c in customers 
    where c.CustomerID.CompareTo(txtSerchId.Text) >= 0 
    select c;

if (result != null)
{
    IEnumerator<Customer> resultEnum = result.GetEnumerator();
    while (resultEnum.MoveNext())
    {
        Customer c = (Customer)resultEnum.Current;
        addToDataSet(Guid.NewGuid().ToString(), c);
    }
    ShowResult();
}
else
{
    MessageBox.Show("No Customer found within criteria");
}

异常(exception)是在这一行

IEnumerator<Customer> resultEnum = result.GetEnumerator();

Answer 1

试试这个:

var query = from c in customers where c.CustomerID.Equals(txtSerchId.Text) select c;