输入数据时不更新文本框

Question

朋友们好，我写的是从基础 TextBox 中提取信息，我想通过 TextBox 更新数据库，但是当我输入新值时，旧值并不总是保存新值

后面的代码

protected void Page_Load(object sender, EventArgs e)
{
    string ID = Request.QueryString["Id"].ToString();
    SqlConnection baglan = new SqlConnection(ConnectionString3);
    baglan.Open();
    SqlCommand com = new SqlCommand("Select * from pkategori where Id='" + ID + "'", baglan);

    SqlDataReader oku = com.ExecuteReader();
    if (oku.Read())
    {
        baslik.Text = oku["Tanim"].ToString();
        detaylar.Text = oku["Detaylar"].ToString();
    }

    else
    {
        baslik.Text = "Bulunmadı";

    }
}

按钮点击事件

string ust = Request.QueryString["ID"].ToString();
SqlConnection baglanti = new SqlConnection(ConnectionString3);
baglanti.Open();
string kayit = "update pkategori set Tanim=@Tanim where Id=@Id";
SqlCommand komut = new SqlCommand(kayit, baglanti);
komut.Parameters.AddWithValue("@Tanim", baslik.Text);
komut.Parameters.AddWithValue("@Id", ust);
komut.ExecuteNonQuery();
baglanti.Close();

Answer 1

简单，只需将您的代码包装在Page_Load 中的!IsPostBack-check 中：

protected void Page_Load(object sender, EventArgs e)
{
     if(!IsPostBack)
     {
        string ID = Request.QueryString["Id"].ToString();
        SqlConnection baglan = new SqlConnection(ConnectionString3);
        baglan.Open();
        SqlCommand com = new SqlCommand("Select * from pkategori where Id='" + ID + "'", baglan);

        SqlDataReader oku = com.ExecuteReader();
        if (oku.Read())
        {
            baslik.Text = oku["Tanim"].ToString();
            detaylar.Text = oku["Detaylar"].ToString();
        }
        else
        {
            baslik.Text = "Bulunmadı";
        }
    }
}

否则，您将从数据库中加载文本并且更改的值将被覆盖。