"Format of the initialization string does not conform to specification starting at index 0."

Question

我收到这个错误：

Format of the initialization string does not conform to specification starting at index 0.

我的代码是：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Security.Cryptography;
using System.Data.OleDb;
using System.Configuration;

namespace LibrarySystem
{
    public partial class PIDD : Form
    {
        public PIDD()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            this.Close();
            frmMed Med = new frmMed();
            Med.Show();

            var conn = new SqlConnection("ConnectionString");
            //var command = new SqlCommand("Patient.dbo.P_ID", connection);
            var command = new SqlCommand("SELECT P_ID FROM Patient WHERE id='" + textBox1.Text + "",connection);

            connection.Open();
            var reader = command.ExecuteReader();
            if (reader.Read())
            {
                textBox1.Text = reader["id"].ToString();
            }
            else
            {
                // No entry found
            }
            connection.Close();
        }

        private void textBox1_TextChanged(object sender, EventArgs e)
        {
        }

        public SqlConnection connection { get; set; }
    }
}

我正在尝试写入数据库中已存在的 ID，并检查 ID 是否正确，然后在下一个帧中显示它，

Answer 1

初始化字符串的格式不符合从索引 0 开始的规范。 只是一个 ArgumentException 消息，来自给 SqlConnection(string) constructor: give it a valid SQL Server connection string 一个错误的连接字符串（即而不是 "ConnectionString")，您将准备好继续处理代码中的其他问题。

作为参考，您可以看到我如何快速、最小地变形您的代码以确认 LINQPad 4 中给定错误消息的来源：

"Format of the initialization string does not conform to specification starting at index 0."

"Format of the initialization string does not conform to specification starting at index 0."

c#

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