Question

我正在创建一个小型数据库，使用sql server作为后端，vb作为前端，我几乎使它工作但是我偶然发现了这个错误：

类型'System.Data.SqlClient.SqlException'的未处理异常   发生在System.Data.dll
中
附加信息：多部分标识符   无法绑定“System.Data.DataRowView”。

这是我的代码：

Imports System.Data.SqlClient
Public Class searchDialog

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

    Private Sub Button1_Click(sender As System.Object, e As System.EventArgs) Handles Button1.Click
        Dim ds As New DataSet
        Dim query As String = "select * from Books where " + colNames.SelectedValue.ToString + " LIKE " + "'%" + colValues.Text + "%'"
        BooksTableAdapter.Connection.Open()
        Dim adp As New SqlDataAdapter(query, BooksTableAdapter.Connection.ConnectionString)
        adp.Fill(ds, "Books")
        BooksTableAdapter.Connection.Close()
        filteredRecords.DataSource = ds
        filteredRecords.DataMember = "Books"
    End Sub
End Class

Answer 1

问题出在这里：

Dim query As String = "select * from Books where " + colNames.SelectedValue.ToString + " LIKE " + "'%" + colValues.Text +  "%'"

我猜colNames是一个绑定到DataTable或Dataview的控件，因此selectedValue是DataRowView。

这篇文章listbox selected item give me " System.Data.DataRowView" , C# winforms中的问题完全相同。您无法设置selectedValue.ToString，因为它将始终返回“System.Data.DataRowView”。您需要将所选项目转换为DataRowView，然后您可以从中获取值。

无法绑定多部分标识符“System.Data.DataRowView”。“

1 个答案: