Question

我正在调用一个模式表格（ss），其中显示了给定搜索条件的所有股票代码。用户选择一个项目

private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e) 
{
    selectedStockDescription = dgv_StckSrchRes.Rows[e.RowIndex].Cells[1].Value.ToString();
    selectedStockCode = dgv_StckSrchRes.Rows[e.RowIndex].Cells[0].Value.ToString();

    DialogResult result = MessageBox.Show(
        (selectedStockDescription), 
        "Add this item to the order?", 
         MessageBoxButtons.YesNoCancel, 
         MessageBoxIcon.Question);

    if (result == DialogResult.Yes) 
    {
        stockCode = selectedStockCode;
        stockDescription = selectedStockDescription;

        this.Close();                         
    }
    else if (result == DialogResult.No) 
    { 
        this.Focus();
    }
    else if (result == DialogResult.Cancel) 
    {
        this.Close(); 
    } 
}

和以下两个公共字符串以 modal形式设置：

public string stockCode { get; set; }
public string stockDescription { get; set; }

在我的父表格中，我将这些值分配给在类级别初始化的两个变量。

using (StockSearch ss = new StockSearch(selectedDept, txb_StockCode.Text))
{
    if (ss.ShowDialog() != DialogResult.Cancel)
        stckCd = ss.stockCode;
    stockDescription = ss.stockDescription;

    SetFormProperties();
    PopulateStockInformation();
    GetLeadTimes();   
}

但是仅设置stockDescription变量。即使填充了右侧的值stckCd，null仍为ss.stockCode。它只是没有为stckCd分配值，我需要它才能访问应用程序中其他位置的值。我尝试用一个值初始化它们，但不能解决这个问题。

任何人都可以开导我吗？

Answer 1

问题出在StockSearch（模态形式）一侧：关闭StockSearch时应设置DialogResult：有两个这里可能的关闭-取消（默认行为）和确定。

  private void dataGridView1_CellContentClick(object sender, DataGridViewCellEventArgs e) {
    selectedStockDescription = dgv_StckSrchRes.Rows[e.RowIndex].Cells[1].Value.ToString();
    selectedStockCode = dgv_StckSrchRes.Rows[e.RowIndex].Cells[0].Value.ToString();

    DialogResult result = MessageBox.Show(
      (selectedStockDescription), 
      "Add this item to the order?", 
       MessageBoxButtons.YesNoCancel, 
       MessageBoxIcon.Question);

    if (result == DialogResult.Yes) {
      // Confirmed: close the form WITH the choice made (DialogResult.OK)
      stockCode = selectedStockCode;
      stockDescription = selectedStockDescription;

      // this.Close();                     // <- cause of the misbehaviour           
      this.DialogResult = DialogResult.OK; // <- not Close (with cancel) but with OK
    }
    else if (result == DialogResult.No)  
      // Not confirmed: keep on selecting 
      this.Focus();
    else // no need in "if": all the rest is Cancel 
      // Cancellation: close the form WITHOUT choice (DialogResult.Cancel)
      this.Close(); // <- Close with DialogResult.Cancel
  }

在父表单方面

   using (StockSearch ss = new StockSearch(selectedDept, txb_StockCode.Text)) {
     if (ss.ShowDialog() != DialogResult.Cancel) {
       stckCd = ss.stockCode;
       // You should not change stockDescription on DialogResult.Cancel  
       stockDescription = ss.stockDescription;  
     } 

     //TODO: it seems that these three calls should be within if as well
     SetFormProperties();
     PopulateStockInformation();
     GetLeadTimes();   
   }

字符串变量分配不起作用C＃

1 个答案: