C＃无法建立SQL Server连接

Question

我有一个带有“添加配方”按钮的基本表单，用于将以下内容写入SQL Server Express数据库：

1. 食谱名称
2. 食谱成分
3. 食谱说明
4. 食谱图片

表单位于问题的底部，当我点击“添加配方”按钮时，它会调用updatedate()方法，此方法如下所示：

private void updatedata()
{ 
        // filestream object to read the image
        // full length of image to a byte array
        try
        {
                // try to see if the image has a valid path
                if (imagename != "")
                {
                    FileStream fs;
                    fs = new FileStream(@imagename, FileMode.Open, FileAccess.Read);

                    // a byte array to read the image
                    byte[] picbyte = new byte[fs.Length];
                    fs.Read(picbyte, 0, System.Convert.ToInt32(fs.Length));
                    fs.Close();

                    //open the database using odp.net and insert the lines
                    string connstr = @"Data Source=.;Initial Catalog=RecipeOrganiser;Persist Security Info=True;User ID=sa";

                    SqlConnection conn = new SqlConnection(connstr);
                    conn.Open();
                    string query;
                    query = "insert into Recipes(RecipeName,RecipeImage,RecipeIngredients,RecipeInstructions) values (" + textBox1.Text + "," + " @pic" + "," + textBox2.Text + "," + textBox3.Text + ")";

                    SqlParameter picparameter = new SqlParameter();
                    picparameter.SqlDbType = SqlDbType.Image;
                    picparameter.ParameterName = "pic";
                    picparameter.Value = picbyte;
                    SqlCommand cmd = new SqlCommand(query, conn);
                    cmd.Parameters.Add(picparameter);
                    cmd.ExecuteNonQuery();
                    MessageBox.Show("Image successfully saved");
                    cmd.Dispose();
                    conn.Close();
                    conn.Dispose();
                    Connection();
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }

我的问题是，当我点击“添加配方”按钮并填充了信息时，它会冻结约30秒然后显示以下错误，我已经检查过SQL Server服务正在运行您的身份。任何人都可以提出我在这里做错的建议吗？



表格形象

Answer 1

 string connstr = @"Data Source=.;Initial Catalog=RecipeOrganiser;Persist Security Info=True;User ID=sa";

需要

 string connstr = @"Server=localhost\{SERVER_NAME};Database=RecipeOrganiser;Trusted_Connection=True;";

您可以从属性值“Name”用户获取SERVER_NAME SQL Server属性

Answer 2

使用以下链接

 SqlConnection con = new SqlConnection("Data Source=servername\\SQLEXPRESS;Initial Catalog=databasename;User ID=sa;Password=yoursqlserverpassword");

希望它能帮到你

Answer 3

您的连接字符串对我来说不太好...尝试使用.Net SqlConnectionStringBuilder类创建有效的连接字符串...设置DataSource，InitialCatalog和IntegratedSecurity或UserId和Password属性