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最新推荐文章于 2024-10-13 00:46:54 发布

原创最新推荐文章于 2024-10-13 00:46:54 发布 · 864 阅读

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#table #exception #datagrid #user #stream #c

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博客介绍了访问DataTable对象时需注意区分大小写，其包含Constraint对象集合可确保数据完整性，并给出使用示例。还展示了从流读取图片到PictureBox的代码，同时处理了可能出现的异常。

English study
navigate:

v. 1.航行 2.驾驶
A single dimension array
dimension:

n. 1.尺寸，尺度 2.维（数） 3.容积，面积
When accessing DataTable objects, note that they are conditionally case-sensitive.
当访问 DataTable 对象时，注意它们是按条件区分大小写的。
The DataTable contains a collection of Constraint objects that can be used to ensure the integrity of the data.
DataTable 包含可用于确保数据完整性的 Constraint 对象的集合。

DataTable , DataRow, DataColumn  ---------How to use.
        Dim table_user As DataTable
        Dim col_Id As DataColumn
        Dim col_UserName As DataColumn
        Dim row1 As DataRow
        Try
            table_user = New DataTable("userTable")
            col_Id = New DataColumn("id", Type.GetType("System.Int32"))
            col_UserName = New DataColumn("userName", Type.GetType("System.String"))
            table_user.Columns.Add(col_Id)
            table_user.Columns.Add(col_UserName)
            row1 = table_user.NewRow
            row1("id") = 123
            row1("username") = "zhuxinbin"
            table_user.Rows.Add(row1)
            DataGrid1.DataSource = table_user
        Catch ex As Exception
            MessageBox.Show(ex.Message)
        End Try
从流读取图片到picturebox.txt
        Dim bin As Stream
        Try
            bin = New FileStream("C:/Documents and Settings/All Users/Documents/My Pictures/Sample Pictures/Sunset.jpg", FileMode.Open)
            'PictureBox1.Image = PictureBox1.Image.FromStream(bin)'?里容易出?
      PictureBox1.Image = Image.FromStream(bin)'??方式比?好
            PictureBox1.Refresh()'don't need
        Catch ex As Exception
            MessageBox.Show(ex.Message)
        Finally
            bin.Close()
        End Try