Question

我只有一个日期“ DateOfyear”，我想在将日期插入文本框中之前检查一下DB中已经存在，但是在C＃中使用了后面的代码。

我将给出一个示例，例如我想做的事，我知道这不是正确的代码或我所需要的，但这只是一个示例，因为我不希望人们过去或使用SQLCommand / SqlServer等解决方案我想要类似的代码。

DateTime InvoiceDateFrom = new DateTime();
DateTime InvoiceDateTo = new DateTime();
InvoiceDateFrom = Convert.ToDateTime(txtDatRiferiment.Text);
InvoiceDateTo = Convert.ToDateTime(txtDatRiferiment.Text);
if (InvoiceDateFrom == InvoiceDateTo)
{
    errorMessage = vea.ErrorMessage;
}

Answer 1

您可以使用DateTime.compareTo方法：

public static  int findMinValue(int[] List)
        {

            int min;
            min = List[0];
            return min;
        }

        static void countingsort(int[] List, int max)
        /* pre:  List has .Length integers in it. The maximum value in the list is max.
        * post: Using the countingsort algorithm, sort the list of integers into ascending order. */
        {

            // ADD CODE FOR METHOD countingsort BELOW
            Stopwatch timer = new Stopwatch();
                timer.Start();
            int[] countArray = new int[max + 1];
            int min = findMinValue(countArray);
            for (int i = 0; i <= max; i++)
            {
                countArray[i] = 0;

            }
            for (int x = 0; x < List.Length; x++)
            {
                countArray[List[x]] = countArray[List[x]] + min;
                // or countArray[List[x]]++;


            }
            int index = 0;
            for (int y = 0; y <= max; y++)
            {
                //List[y] = countArray[y];
                for (int j = 0; j < countArray[y]; j++)
                {
                    List[index] = y;
                    index = index + 1;
                    // or index++
                }
            }
            Display(List);
            DisplayCount(countArray);
            timer.Stop();

            Console.WriteLine("Time Taken for Basic Selection Sort is {0} milliseconds", timer.ElapsedMilliseconds);



        }
        public static void DisplayCount(int[] Array)
        {
            int count = 0;
            for (int i = 0; i < Array.Length; i++)
            {
                count++;
            }
            Console.WriteLine("Elements in count array is {0} ", count);
        }

更多信息here.

如何使用代码Behind检查日期是否已经存在？

1 个答案: