学习心得之输入输出控件
学习笔记之C#输入输出控件
思维导图：
1. Textbox 直接在框框中使用可用来输入输出
2. DataTimePicker
CustomFormat属性：可以用来控制控件值显示的日期格式。在设置这个属性之前，需要将Format属性设置为Custom，表示使用自定义的格式。
3. Radiobutton
Checked 属性设置为 true，并且调用 Click 事件处理程序。当 Checked 属性的值更改时，将引发 CheckedChanged 事件。如果 AutoCheck 属性设置为 true(默认值)，则当选择单选按钮时，将自动清除该组中的所有其他单选按钮。
4. combobox
ComboBox的常用下拉格式DropDownStyle 有三种，分别是：
Simple是文本可编辑，下拉列表总可见；
DropDown是默认样式，文本可编辑，下拉需用户点击箭头；
DropDownList是文本不可编辑，下拉需用户点击箭头
获取控件选中项的内容，代码如下所示：
-
MessageBox.Show(comboBox1.SelectedItem.ToString());
获取控件选中项的索引，代码如下所示：
-
MessageBox.Show(comboBox1.SelectedIndex.ToString());
5. PictureBox
AutoSize 属性：自动调整大小以显示整幅图形
loadpicture：picture加载图片的方法。
picture.LoadPicture([FileName], [Size], [ColorDepth], [X], [Y])
例子代码如下：
private void button1_Click(object sender, EventArgs e)
{
SqlConnection sqlConnection = new SqlConnection();
sqlConnection.ConnectionString ="Server=(local);Database=药品工作站管理系统;Integrated Security=sspi";
SqlCommand sqlCommand = new SqlCommand();
sqlCommand.Connection = sqlConnection;
sqlCommand.CommandText = "SELECT * FROM 操作员信息 WHERE 操作员编号=@操作员编号;";
sqlCommand.Parameters.AddWithValue("@操作员编号", this.no.Text.Trim());
SqlDataAdapter sqlDataAdapter = new SqlDataAdapter();
sqlDataAdapter.SelectCommand = sqlCommand;
DataTable Table = new DataTable();
sqlConnection.Open();
sqlDataAdapter.Fill(Table);
SqlDataReader sqlDataReader = sqlCommand.ExecuteReader();
if (sqlDataReader.Read())
{
this.no.Text = sqlDataReader["操作员编号"].ToString();
this.name.Text = sqlDataReader["姓名"].ToString();
this.Male.Checked = (bool)sqlDataReader["性别"];
this.Female.Checked = !(bool)sqlDataReader["性别"];
this.phone.Text = sqlDataReader["联系电话"].ToString();
}
sqlDataReader.Close();
}
private void button2_Click(object sender, EventArgs e)
{
if (this.no.Text.Trim() == "")
{
MessageBox.Show("编号不能为空！"); this.name.Focus();
return;
if (this.name.Text.Trim() == "")
{
MessageBox.Show("用户名不能为空！");
this.name.Focus();
return;
}
if (this.phone.Text.Trim() == "") {
MessageBox.Show("手机号不能为空！");
this.phone.Focus();
return;
}
SqlConnection sqlConnection = new SqlConnection();
sqlConnection.ConnectionString =
"Server=(local);Database=药品工作站管理系统;Integrated Security=sspi";
SqlCommand sqlCommand = sqlConnection.CreateCommand();
sqlCommand.CommandText =
"UPDATE 操作员信息"
+ " SET 姓名=@姓名,性别=@性别,联系电话=@联系电话"
+ " WHERE 操作员编号=@操作员编号;";
sqlCommand.Parameters.AddWithValue("@姓名", this.name.Text.Trim());
sqlCommand.Parameters.AddWithValue("@性别", this.Male.Checked);
sqlCommand.Parameters.AddWithValue("@联系电话",this.phone.Text.Trim());
sqlCommand.Parameters.AddWithValue("@操作员编号", this.no.Text.Trim());
sqlConnection.Open();
int rowAffected = sqlCommand.ExecuteNonQuery();
sqlConnection.Close();
if (rowAffected == 1)
{
MessageBox.Show("更新成功。");
}
else {
MessageBox.Show("更新失败！");
}
}
private void button3_Click(object sender, EventArgs e)
{
if (this.no.Text.Trim() == "") {
MessageBox.Show("编号不能为空！");
this.name.Focus();
return;
}
if (this.name.Text.Trim() == "")
{
MessageBox.Show("用户名不能为空！");
this.name.Focus();
return;
}
if (this.phone.Text.Trim() == "")
{
MessageBox.Show("手机号不能为空！");
this.phone.Focus();
return;
}
SqlConnection sqlConnection = new SqlConnection();
sqlConnection.ConnectionString =
"Server=(local);Database=药品工作站管理系统;Integrated Security=sspi";
SqlCommand sqlCommand = sqlConnection.CreateCommand();
sqlCommand.CommandText =
"INSERT 操作员信息 (操作员编号,姓名,性别,联系电话) VALUES(@操作员编号,@姓名,@性别,@联系电话);";
sqlCommand.Parameters.AddWithValue("@姓名", this.name.Text.Trim());
sqlCommand.Parameters.AddWithValue("@性别", this.Male.Checked);
sqlCommand.Parameters.AddWithValue("@联系电话", this.phone.Text.Trim());
sqlCommand.Parameters.AddWithValue("@操作员编号", this.no.Text.Trim());
int rowAffected = 0;
try
{
sqlConnection.Open();
rowAffected = sqlCommand.ExecuteNonQuery();
}
catch (SqlException sqlEx) {
if (sqlEx.Number == 2627)
{
MessageBox.Show("您增加的用操作员已存在，请重新输入！\n");
}
}
finally {
sqlConnection.Close();
}
if (rowAffected == 1)
{
MessageBox.Show("添加成功。");
}
else
{
MessageBox.Show("添加失败！");
}
}
}
6. DataGridview
DataSource 属性：绑定数据源
代码如下：
public partial class 药品信息查询 : Form
{
public 药品信息查询()
{
InitializeComponent();
}
private void button1_Click(object sender, EventArgs e)
{
SqlConnection sqlConnection = new SqlConnection();
sqlConnection.ConnectionString =
"Server=(local);Database=药品工作站管理系统;Integrated Security=sspi";
SqlCommand sqlCommand = new SqlCommand();
sqlCommand.Connection = sqlConnection;
sqlCommand.CommandText = "SELECT * FROM 药品信息;";
SqlDataAdapter sqlDataAdapter = new SqlDataAdapter();
sqlDataAdapter.SelectCommand = sqlCommand;
DataTable Table = new DataTable();
sqlConnection.Open();
sqlDataAdapter.Fill(Table);
sqlConnection.Close();
this.dgv.DataSource =Table;
}
}
运行结果如下：
