从 asp.net C# 网站访问数据库

Question

我有一个要开发的 asp.net 网站，但从数据库加载数据时遇到问题。它在 C# WebForm 应用程序中运行良好，我想知道我需要做什么才能让它在 asp.net 项目中正常工作并将结果绑定到下拉列表以供选择。

try
            {
                SqlConnectionStringBuilder connectionStringBuilder = new SqlConnectionStringBuilder
                {
                    DataSource = "127.0.0.1",
                    InitialCatalog = "PIIMSDATA",
                    IntegratedSecurity = true
                };
        SqlConnection cs = new SqlConnection(connectionStringBuilder.ToString());
                SqlDataAdapter da = new SqlDataAdapter("SELECT * FROM Book1 Order by ID", cs);


                }
                System.Data.DataTable dt = new System.Data.DataTable();
                da.Fill(dt);

                //DropDownList2.DataSource = ds.Tables[0];
                //DropDownList2.DataTextField = "ID";
                //DropDownList2.DataValueField = "ID";
                //DropDownList2.DataBind();
            }
            catch (Exception ex)
            {
                ClientScript.RegisterStartupScript(this.GetType(), "myalert", "alert('" + ex + "');", true);
                //MessageBox.Show(ex.Message);
            }
        }

Answer 1

您可以在 web.config 中创建连接字符串并将此参数绑定到下拉列表中

试试这个 link ： http://www.c-sharpcorner.com/UploadFile/rohatash/binding-dropdownlist-with-database-and-display-data-in-gridv/

Answer 2

有很多方法可以做到这一点。这是我曾经尝试过的一个例子：

    public string connectionString = "Data Source = YOUCANSEEONSQLSERVER; Initial Catalog = DATABASENAME; User Id = sa; Password = sqlpasswordifyouuse";

    private void Valetin_Load(object sender, EventArgs e)
    {
        OPIDCB.ResetText();
        ValetCB.ResetText();
        SqlConnection sqlconn = new SqlConnection(pr.connectionString);
        SqlCommand sqlselect1 = new SqlCommand("Select EmpID, EmpName from Employees.Employee where IDPosition = 'OP'", sqlconn);
        sqlconn.Open();
        SqlDataReader dr1 = sqlselect1.ExecuteReader();

        while (dr1.Read())
        {
            ArrayList MyAL = new ArrayList();
            ArrayList MyAL2 = new ArrayList();
            MyAL.Add(dr1.GetString(0));
            MyAL2.Add(dr1.GetString(1));
            foreach (string s in MyAL)
                foreach (string s2 in MyAL2)
                {
                    OPIDCB.Items.Add(s + " " + s2);
                }
            OPIDCB.SelectedIndex = 0;
        }
        dr1.Close();
        sqlconn.Close();

    }

如果您对该代码感到困惑，可以访问此 link：What is the right way to populate a DropDownList from a database?

希望对您有所帮助。

从 asp.net C# 网站访问数据库

Database access from within asp.net C# web sitie

c#

asp.net

asp.net-mvc