Question

您好我将vb转换为c sharp

Dim Query As String = "UPDATE F_Shqip SET Lika_Sh=@Fjalet_Sh WHERE Id_Sh=@Id_Sh"
            Dim cmd As SqlCommand = New SqlCommand(Query, con)

            cmd.Parameters.AddWithValue("@Lika_Sh", Trim(Me.txbLikaSh.Text))
            cmd.Parameters.AddWithValue("@Id_Sh", Me.ListBox1.SelectedItem(0).ToString)

简明扼要：

string Query = "UPDATE F_Shqip SET Lika_Sh=@Lika_Sh WHERE Id_Sh=@Id_Sh";
                SqlCommand cmd = new SqlCommand(Query, con);

//two lines with errors
                cmd.Parameters.AddWithValue("@Lika_Sh", Strings.Trim(this.txbLikaSh.Text));
                cmd.Parameters.AddWithValue("@Id_Sh", this.ListBox1.SelectedItem(0).ToString);

Answer 1

尝试this.ListBox1.SelectedItem[0]而不是this.ListBox1.SelectedItem(0)
C＃对数组使用方括号，但VB.NET使用括号表示数组。

Answer 2

而不是

cmd.Parameters.AddWithValue("@Lika_Sh", Strings.Trim(this.txbLikaSh.Text));
cmd.Parameters.AddWithValue("@Id_Sh", this.ListBox1.SelectedItem(0).ToString);

试试这个：

cmd.Parameters.AddWithValue("@Lika_Sh", this.txbLikaSh.Text.Trim());
cmd.Parameters.AddWithValue("@Id_Sh", this.ListBox1.SelectedItem[0].ToString());

以下链接可能有用：

CodeProject - Complete Comparison for VB.NET and C#

Wikipedia - Comparison of C Sharp and Visual Basic .NET

代码转换器：

DeveloperFusion - Convert VB.NET to C#

DeveloperFusion - Convert C# to VB.NET

Answer 3

如果您的Listbox只有一个选定项目，请将您的代码更改为

cmd.Parameters.AddWithValue("@Id_Sh", this.ListBox1.SelectedItem.ToString);

如果您的Listbox包含多个所选项目且SelectionMode为MultiExtended，则可以使用ListBox.SelectedIndices代替;

cmd.Parameters.AddWithValue("@Id_Sh", this.ListBox1.SelectedIndices[0].ToString);

将VB代码转换为C＃时出错

3 个答案: