Question

我附上了代码以供参考。我正在尝试为我的项目详细信息创建数据库。我目前有两种形式：

主要表格
项目明细表格

用于切换各种表格的主要表格

项目详细信息表单用于添加/编辑/加载项目详细信息

我在Visual Basic中的主要形式是这样的。

Public Class Form1

    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
    End Sub

    Private Sub Bt_Project_Details_Click(sender As Object, e As EventArgs) Handles Bt_Project_Details.Click
        Me.Hide()
        Project_Details_Form.Show()
    End Sub
End Class

我的项目详细信息表格如下所示。

Public Class Project_Details_Form

    Private Sub Project_Details_Form_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        'TODO: This line of code loads data into the 'Project_Data_Set.Project_Data_Table' table. You can move, or remove it, as needed.
        Me.Project_Data_TableTableAdapter.Fill(Me.Project_Data_Set.Project_Data_Table)
    End Sub

    Private Sub Bt_Load_Project_Click(sender As Object, e As EventArgs) Handles Bt_Load_Project.Click
    End Sub

    Private Sub Bt_Cancel_Click(sender As Object, e As EventArgs) Handles Bt_Cancel.Click
        Me.Hide()
        Form1.Show()
    End Sub

    Private Sub BindingNavigatorAddNewItem_Click(sender As Object, e As EventArgs) Handles BindingNavigatorAddNewItem.Click
        Project_Data_TableBindingSource.AddNew()
    End Sub

    Private Sub Project_Data_TableBindingNavigatorSaveItem_Click(sender As Object, e As EventArgs) Handles Project_Data_TableBindingNavigatorSaveItem.Click
        Me.Validate()
        Me.Project_Data_TableBindingSource.EndEdit()
        Me.TableAdapterManager.UpdateAll(Me.Project_Data_Set)
    End Sub

    Private Sub BindingNavigatorDeleteItem_Click(sender As Object, e As EventArgs) Handles BindingNavigatorDeleteItem.Click
        Project_Data_TableBindingSource.RemoveCurrent()
    End Sub

    Private Sub FillByToolStripButton_Click(sender As Object, e As EventArgs)
        Try
            Me.Project_Data_TableTableAdapter.FillBy(Me.Project_Data_Set.Project_Data_Table)
        Catch ex As System.Exception
            System.Windows.Forms.MessageBox.Show(ex.Message)
        End Try

    End Sub
End Class

现在我遇到了一些问题：

每当我运行程序时，尝试输入保存但值为空的第一个条目数据。下次正确存储数据。如何让我的第一个条目可见？
在下面的代码中：
```
Private Sub BindingNavigatorAddNewItem_Click(sender As Object, e As EventArgs) Handles BindingNavigatorAddNewItem.Click
    Project_Data_TableBindingSource.AddNew()

End Sub
```
我正在使用AddNew()。这工作正常，但问题是即使我不输入数据，如日期，名称保持为空，其位置记录的数据仅存储为空。我想说如果任何项目数据集为空都会给出错误消息（因为用户必须输入这些数据）

Answer 1

还有其他方法我可以单独指定值。就像我的项目数据库包含项目名称，客户名称等，如果我说新按钮按下清除所有字段。一旦表单填写单个值，一旦按下保存按钮就会记录

Private Sub BindingNavigatorAddNewItem_Click(sender As Object, e As EventArgs) Handles BindingNavigatorAddNewItem.Click
        Project_Data_TableBindingSource.AddNew()
    End Sub

更新数据库时出现问题

1 个答案: