SQL 用于从 table 获取数据时按钮不起作用的问题
Issues with a button not working when SQL is being used to get data from a table
这是我从 Internet 上获得的一些代码，因为我对 SQL 还很陌生，在我遇到这个我想添加到我的桌面应用程序中的登录功能之前，我无意使用它。这是代码。
SqlConnection connection = new SqlConnection(@"Data Source=JOASH;Initial Catalog=Logins;Integrated Security=True");
SqlDataAdapter dataAdapter = new SqlDataAdapter("SELECT COUNT(*) FROM login WHERE Username='" + flatTextBox1.Text + "' AND Password='" + flatTextBox2 + "'", connection);
DataTable dataTable = new DataTable();
dataAdapter.Fill(dataTable);
if (dataTable.Rows[0][0].ToString() == "1")
{
this.Hide();
Dashboard dashboard_form = new Dashboard();
dashboard_form.Show();
}
else
{
MessageBox.Show("Authentication failed!");
}
那是按钮发生 SQL 事情的部分。基本上，点击一个按钮，代码就会被执行。但是，出于某种原因，当我单击该按钮时，代码未执行或无法正常工作。 （我猜它没有执行。）我真的希望有人能帮我解决这个问题。该按钮将不起作用。
编辑：根据 Nirman 的要求，这是表单设计器代码。
namespace subTerraApplication
{
partial class WelcomePage
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.formSkin1 = new FlatUI.FormSkin();
this.flatTextBox2 = new FlatUI.FlatTextBox();
this.flatLabel2 = new FlatUI.FlatLabel();
this.flatTextBox1 = new FlatUI.FlatTextBox();
this.flatLabel1 = new FlatUI.FlatLabel();
this.flatMini1 = new FlatUI.FlatMini();
this.flatMax1 = new FlatUI.FlatMax();
this.flatClose1 = new FlatUI.FlatClose();
this.flatButton1 = new FlatUI.FlatButton();
this.formSkin1.SuspendLayout();
this.SuspendLayout();
//
// formSkin1
//
this.formSkin1.BackColor = System.Drawing.Color.White;
this.formSkin1.BaseColor = System.Drawing.Color.FromArgb(((int)(((byte)(60)))), ((int)(((byte)(70)))), ((int)(((byte)(73)))));
this.formSkin1.BorderColor = System.Drawing.Color.FromArgb(((int)(((byte)(53)))), ((int)(((byte)(58)))), ((int)(((byte)(60)))));
this.formSkin1.Controls.Add(this.flatButton1);
this.formSkin1.Controls.Add(this.flatTextBox2);
this.formSkin1.Controls.Add(this.flatLabel2);
this.formSkin1.Controls.Add(this.flatTextBox1);
this.formSkin1.Controls.Add(this.flatLabel1);
this.formSkin1.Controls.Add(this.flatMini1);
this.formSkin1.Controls.Add(this.flatMax1);
this.formSkin1.Controls.Add(this.flatClose1);
this.formSkin1.Dock = System.Windows.Forms.DockStyle.Fill;
this.formSkin1.FlatColor = System.Drawing.Color.FromArgb(((int)(((byte)(52)))), ((int)(((byte)(152)))), ((int)(((byte)(219)))));
this.formSkin1.Font = new System.Drawing.Font("Segoe UI", 12F);
this.formSkin1.HeaderColor = System.Drawing.Color.FromArgb(((int)(((byte)(45)))), ((int)(((byte)(47)))), ((int)(((byte)(49)))));
this.formSkin1.HeaderMaximize = false;
this.formSkin1.Location = new System.Drawing.Point(0, 0);
this.formSkin1.Name = "formSkin1";
this.formSkin1.Size = new System.Drawing.Size(256, 349);
this.formSkin1.TabIndex = 0;
this.formSkin1.Text = "subTerra Build 1";
//
// flatTextBox2
//
this.flatTextBox2.BackColor = System.Drawing.Color.Transparent;
this.flatTextBox2.FocusOnHover = false;
this.flatTextBox2.Location = new System.Drawing.Point(125, 135);
this.flatTextBox2.MaxLength = 32767;
this.flatTextBox2.Multiline = false;
this.flatTextBox2.Name = "flatTextBox2";
this.flatTextBox2.ReadOnly = false;
this.flatTextBox2.Size = new System.Drawing.Size(109, 29);
this.flatTextBox2.TabIndex = 10;
this.flatTextBox2.TextAlign = System.Windows.Forms.HorizontalAlignment.Left;
this.flatTextBox2.TextColor = System.Drawing.Color.FromArgb(((int)(((byte)(192)))), ((int)(((byte)(192)))), ((int)(((byte)(192)))));
this.flatTextBox2.UseSystemPasswordChar = true;
//
// flatLabel2
//
this.flatLabel2.AutoSize = true;
this.flatLabel2.BackColor = System.Drawing.Color.Transparent;
this.flatLabel2.Font = new System.Drawing.Font("Segoe UI", 15.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.flatLabel2.ForeColor = System.Drawing.Color.White;
this.flatLabel2.Location = new System.Drawing.Point(13, 135);
this.flatLabel2.Name = "flatLabel2";
this.flatLabel2.Size = new System.Drawing.Size(99, 30);
this.flatLabel2.TabIndex = 9;
this.flatLabel2.Text = "Password";
//
// flatTextBox1
//
this.flatTextBox1.BackColor = System.Drawing.Color.Transparent;
this.flatTextBox1.FocusOnHover = false;
this.flatTextBox1.Location = new System.Drawing.Point(125, 81);
this.flatTextBox1.MaxLength = 32767;
this.flatTextBox1.Multiline = false;
this.flatTextBox1.Name = "flatTextBox1";
this.flatTextBox1.ReadOnly = false;
this.flatTextBox1.Size = new System.Drawing.Size(109, 29);
this.flatTextBox1.TabIndex = 8;
this.flatTextBox1.TextAlign = System.Windows.Forms.HorizontalAlignment.Left;
this.flatTextBox1.TextColor = System.Drawing.Color.FromArgb(((int)(((byte)(192)))), ((int)(((byte)(192)))), ((int)(((byte)(192)))));
this.flatTextBox1.UseSystemPasswordChar = false;
//
// flatLabel1
//
this.flatLabel1.AutoSize = true;
this.flatLabel1.BackColor = System.Drawing.Color.Transparent;
this.flatLabel1.Font = new System.Drawing.Font("Segoe UI", 15.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.flatLabel1.ForeColor = System.Drawing.Color.White;
this.flatLabel1.Location = new System.Drawing.Point(13, 81);
this.flatLabel1.Name = "flatLabel1";
this.flatLabel1.Size = new System.Drawing.Size(106, 30);
this.flatLabel1.TabIndex = 7;
this.flatLabel1.Text = "Username";
//
// flatMini1
//
this.flatMini1.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
this.flatMini1.BackColor = System.Drawing.Color.White;
this.flatMini1.BaseColor = System.Drawing.Color.FromArgb(((int)(((byte)(45)))), ((int)(((byte)(47)))), ((int)(((byte)(49)))));
this.flatMini1.Font = new System.Drawing.Font("Marlett", 12F);
this.flatMini1.Location = new System.Drawing.Point(189, -1);
this.flatMini1.Name = "flatMini1";
this.flatMini1.Size = new System.Drawing.Size(18, 18);
this.flatMini1.TabIndex = 6;
this.flatMini1.Text = "flatMini1";
this.flatMini1.TextColor = System.Drawing.Color.FromArgb(((int)(((byte)(243)))), ((int)(((byte)(243)))), ((int)(((byte)(243)))));
//
// flatMax1
//
this.flatMax1.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
this.flatMax1.BackColor = System.Drawing.Color.White;
this.flatMax1.BaseColor = System.Drawing.Color.FromArgb(((int)(((byte)(45)))), ((int)(((byte)(47)))), ((int)(((byte)(49)))));
this.flatMax1.Font = new System.Drawing.Font("Marlett", 12F);
this.flatMax1.Location = new System.Drawing.Point(213, -1);
this.flatMax1.Name = "flatMax1";
this.flatMax1.Size = new System.Drawing.Size(18, 18);
this.flatMax1.TabIndex = 5;
this.flatMax1.Text = "flatMax1";
this.flatMax1.TextColor = System.Drawing.Color.FromArgb(((int)(((byte)(243)))), ((int)(((byte)(243)))), ((int)(((byte)(243)))));
//
// flatClose1
//
this.flatClose1.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
this.flatClose1.BackColor = System.Drawing.Color.White;
this.flatClose1.BaseColor = System.Drawing.Color.FromArgb(((int)(((byte)(168)))), ((int)(((byte)(35)))), ((int)(((byte)(35)))));
this.flatClose1.Font = new System.Drawing.Font("Marlett", 10F);
this.flatClose1.Location = new System.Drawing.Point(237, 0);
this.flatClose1.Name = "flatClose1";
this.flatClose1.Size = new System.Drawing.Size(18, 18);
this.flatClose1.TabIndex = 4;
this.flatClose1.Text = "flatClose1";
this.flatClose1.TextColor = System.Drawing.Color.FromArgb(((int)(((byte)(243)))), ((int)(((byte)(243)))), ((int)(((byte)(243)))));
//
// flatButton1
//
this.flatButton1.BackColor = System.Drawing.Color.Transparent;
this.flatButton1.BaseColor = System.Drawing.Color.FromArgb(((int)(((byte)(52)))), ((int)(((byte)(152)))), ((int)(((byte)(219)))));
this.flatButton1.Cursor = System.Windows.Forms.Cursors.Hand;
this.flatButton1.Font = new System.Drawing.Font("Segoe UI", 12F);
this.flatButton1.Location = new System.Drawing.Point(74, 209);
this.flatButton1.Name = "flatButton1";
this.flatButton1.Rounded = false;
this.flatButton1.Size = new System.Drawing.Size(106, 32);
this.flatButton1.TabIndex = 11;
this.flatButton1.Text = "Login";
this.flatButton1.TextColor = System.Drawing.Color.FromArgb(((int)(((byte)(243)))), ((int)(((byte)(243)))), ((int)(((byte)(243)))));
//
// WelcomePage
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(256, 349);
this.Controls.Add(this.formSkin1);
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
this.Name = "WelcomePage";
this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
this.Text = "Form1";
this.TransparencyKey = System.Drawing.Color.Fuchsia;
this.formSkin1.ResumeLayout(false);
this.formSkin1.PerformLayout();
this.ResumeLayout(false);
}
#endregion
private FlatUI.FormSkin formSkin1;
private FlatUI.FlatMini flatMini1;
private FlatUI.FlatMax flatMax1;
private FlatUI.FlatClose flatClose1;
private FlatUI.FlatTextBox flatTextBox2;
private FlatUI.FlatLabel flatLabel2;
private FlatUI.FlatTextBox flatTextBox1;
private FlatUI.FlatLabel flatLabel1;
private FlatUI.FlatButton flatButton1;
}
}
问题已解决！缺少点击检测代码！
您是否尝试在 if/else 块中设置断点？
这里有一些注意事项：
使用准备好的语句和参数化查询。永远不要根据用户输入创建动态 SQL，因为应用程序容易受到 SQL injection.
的攻击
这是您使用参数化参数重写的代码：
SqlDataAdapter dataAdapter = new SqlDataAdapter("SELECT COUNT(*) FROM login WHERE Username=@Username AND Password=@Password", connection);
dataAdapter.SelectCommand.Parameters.AddWithValue("@Username", flatTextBox1.Text);
dataAdapter.SelectCommand.Parameters.AddWithValue("@Password", flatTextBox2.Text);
我没有看到任何事件处理程序附加到按钮的设计器代码应该是：
this.flatButton1.Click += new System.EventHandler(this.flatButton1_Click);
您必须定义一个事件处理程序并将代码放入其中
private void flatButton1_Click(object sender, EventArgs e)
{
//Your code here
}
这是我从 Internet 上获得的一些代码，因为我对 SQL 还很陌生，在我遇到这个我想添加到我的桌面应用程序中的登录功能之前，我无意使用它。这是代码。
SqlConnection connection = new SqlConnection(@"Data Source=JOASH;Initial Catalog=Logins;Integrated Security=True");
SqlDataAdapter dataAdapter = new SqlDataAdapter("SELECT COUNT(*) FROM login WHERE Username='" + flatTextBox1.Text + "' AND Password='" + flatTextBox2 + "'", connection);
DataTable dataTable = new DataTable();
dataAdapter.Fill(dataTable);
if (dataTable.Rows[0][0].ToString() == "1")
{
this.Hide();
Dashboard dashboard_form = new Dashboard();
dashboard_form.Show();
}
else
{
MessageBox.Show("Authentication failed!");
}
那是按钮发生 SQL 事情的部分。基本上，点击一个按钮，代码就会被执行。但是，出于某种原因，当我单击该按钮时，代码未执行或无法正常工作。 （我猜它没有执行。）我真的希望有人能帮我解决这个问题。该按钮将不起作用。
编辑：根据 Nirman 的要求，这是表单设计器代码。
namespace subTerraApplication
{
partial class WelcomePage
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.formSkin1 = new FlatUI.FormSkin();
this.flatTextBox2 = new FlatUI.FlatTextBox();
this.flatLabel2 = new FlatUI.FlatLabel();
this.flatTextBox1 = new FlatUI.FlatTextBox();
this.flatLabel1 = new FlatUI.FlatLabel();
this.flatMini1 = new FlatUI.FlatMini();
this.flatMax1 = new FlatUI.FlatMax();
this.flatClose1 = new FlatUI.FlatClose();
this.flatButton1 = new FlatUI.FlatButton();
this.formSkin1.SuspendLayout();
this.SuspendLayout();
//
// formSkin1
//
this.formSkin1.BackColor = System.Drawing.Color.White;
this.formSkin1.BaseColor = System.Drawing.Color.FromArgb(((int)(((byte)(60)))), ((int)(((byte)(70)))), ((int)(((byte)(73)))));
this.formSkin1.BorderColor = System.Drawing.Color.FromArgb(((int)(((byte)(53)))), ((int)(((byte)(58)))), ((int)(((byte)(60)))));
this.formSkin1.Controls.Add(this.flatButton1);
this.formSkin1.Controls.Add(this.flatTextBox2);
this.formSkin1.Controls.Add(this.flatLabel2);
this.formSkin1.Controls.Add(this.flatTextBox1);
this.formSkin1.Controls.Add(this.flatLabel1);
this.formSkin1.Controls.Add(this.flatMini1);
this.formSkin1.Controls.Add(this.flatMax1);
this.formSkin1.Controls.Add(this.flatClose1);
this.formSkin1.Dock = System.Windows.Forms.DockStyle.Fill;
this.formSkin1.FlatColor = System.Drawing.Color.FromArgb(((int)(((byte)(52)))), ((int)(((byte)(152)))), ((int)(((byte)(219)))));
this.formSkin1.Font = new System.Drawing.Font("Segoe UI", 12F);
this.formSkin1.HeaderColor = System.Drawing.Color.FromArgb(((int)(((byte)(45)))), ((int)(((byte)(47)))), ((int)(((byte)(49)))));
this.formSkin1.HeaderMaximize = false;
this.formSkin1.Location = new System.Drawing.Point(0, 0);
this.formSkin1.Name = "formSkin1";
this.formSkin1.Size = new System.Drawing.Size(256, 349);
this.formSkin1.TabIndex = 0;
this.formSkin1.Text = "subTerra Build 1";
//
// flatTextBox2
//
this.flatTextBox2.BackColor = System.Drawing.Color.Transparent;
this.flatTextBox2.FocusOnHover = false;
this.flatTextBox2.Location = new System.Drawing.Point(125, 135);
this.flatTextBox2.MaxLength = 32767;
this.flatTextBox2.Multiline = false;
this.flatTextBox2.Name = "flatTextBox2";
this.flatTextBox2.ReadOnly = false;
this.flatTextBox2.Size = new System.Drawing.Size(109, 29);
this.flatTextBox2.TabIndex = 10;
this.flatTextBox2.TextAlign = System.Windows.Forms.HorizontalAlignment.Left;
this.flatTextBox2.TextColor = System.Drawing.Color.FromArgb(((int)(((byte)(192)))), ((int)(((byte)(192)))), ((int)(((byte)(192)))));
this.flatTextBox2.UseSystemPasswordChar = true;
//
// flatLabel2
//
this.flatLabel2.AutoSize = true;
this.flatLabel2.BackColor = System.Drawing.Color.Transparent;
this.flatLabel2.Font = new System.Drawing.Font("Segoe UI", 15.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.flatLabel2.ForeColor = System.Drawing.Color.White;
this.flatLabel2.Location = new System.Drawing.Point(13, 135);
this.flatLabel2.Name = "flatLabel2";
this.flatLabel2.Size = new System.Drawing.Size(99, 30);
this.flatLabel2.TabIndex = 9;
this.flatLabel2.Text = "Password";
//
// flatTextBox1
//
this.flatTextBox1.BackColor = System.Drawing.Color.Transparent;
this.flatTextBox1.FocusOnHover = false;
this.flatTextBox1.Location = new System.Drawing.Point(125, 81);
this.flatTextBox1.MaxLength = 32767;
this.flatTextBox1.Multiline = false;
this.flatTextBox1.Name = "flatTextBox1";
this.flatTextBox1.ReadOnly = false;
this.flatTextBox1.Size = new System.Drawing.Size(109, 29);
this.flatTextBox1.TabIndex = 8;
this.flatTextBox1.TextAlign = System.Windows.Forms.HorizontalAlignment.Left;
this.flatTextBox1.TextColor = System.Drawing.Color.FromArgb(((int)(((byte)(192)))), ((int)(((byte)(192)))), ((int)(((byte)(192)))));
this.flatTextBox1.UseSystemPasswordChar = false;
//
// flatLabel1
//
this.flatLabel1.AutoSize = true;
this.flatLabel1.BackColor = System.Drawing.Color.Transparent;
this.flatLabel1.Font = new System.Drawing.Font("Segoe UI", 15.75F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
this.flatLabel1.ForeColor = System.Drawing.Color.White;
this.flatLabel1.Location = new System.Drawing.Point(13, 81);
this.flatLabel1.Name = "flatLabel1";
this.flatLabel1.Size = new System.Drawing.Size(106, 30);
this.flatLabel1.TabIndex = 7;
this.flatLabel1.Text = "Username";
//
// flatMini1
//
this.flatMini1.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
this.flatMini1.BackColor = System.Drawing.Color.White;
this.flatMini1.BaseColor = System.Drawing.Color.FromArgb(((int)(((byte)(45)))), ((int)(((byte)(47)))), ((int)(((byte)(49)))));
this.flatMini1.Font = new System.Drawing.Font("Marlett", 12F);
this.flatMini1.Location = new System.Drawing.Point(189, -1);
this.flatMini1.Name = "flatMini1";
this.flatMini1.Size = new System.Drawing.Size(18, 18);
this.flatMini1.TabIndex = 6;
this.flatMini1.Text = "flatMini1";
this.flatMini1.TextColor = System.Drawing.Color.FromArgb(((int)(((byte)(243)))), ((int)(((byte)(243)))), ((int)(((byte)(243)))));
//
// flatMax1
//
this.flatMax1.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
this.flatMax1.BackColor = System.Drawing.Color.White;
this.flatMax1.BaseColor = System.Drawing.Color.FromArgb(((int)(((byte)(45)))), ((int)(((byte)(47)))), ((int)(((byte)(49)))));
this.flatMax1.Font = new System.Drawing.Font("Marlett", 12F);
this.flatMax1.Location = new System.Drawing.Point(213, -1);
this.flatMax1.Name = "flatMax1";
this.flatMax1.Size = new System.Drawing.Size(18, 18);
this.flatMax1.TabIndex = 5;
this.flatMax1.Text = "flatMax1";
this.flatMax1.TextColor = System.Drawing.Color.FromArgb(((int)(((byte)(243)))), ((int)(((byte)(243)))), ((int)(((byte)(243)))));
//
// flatClose1
//
this.flatClose1.Anchor = ((System.Windows.Forms.AnchorStyles)((System.Windows.Forms.AnchorStyles.Top | System.Windows.Forms.AnchorStyles.Right)));
this.flatClose1.BackColor = System.Drawing.Color.White;
this.flatClose1.BaseColor = System.Drawing.Color.FromArgb(((int)(((byte)(168)))), ((int)(((byte)(35)))), ((int)(((byte)(35)))));
this.flatClose1.Font = new System.Drawing.Font("Marlett", 10F);
this.flatClose1.Location = new System.Drawing.Point(237, 0);
this.flatClose1.Name = "flatClose1";
this.flatClose1.Size = new System.Drawing.Size(18, 18);
this.flatClose1.TabIndex = 4;
this.flatClose1.Text = "flatClose1";
this.flatClose1.TextColor = System.Drawing.Color.FromArgb(((int)(((byte)(243)))), ((int)(((byte)(243)))), ((int)(((byte)(243)))));
//
// flatButton1
//
this.flatButton1.BackColor = System.Drawing.Color.Transparent;
this.flatButton1.BaseColor = System.Drawing.Color.FromArgb(((int)(((byte)(52)))), ((int)(((byte)(152)))), ((int)(((byte)(219)))));
this.flatButton1.Cursor = System.Windows.Forms.Cursors.Hand;
this.flatButton1.Font = new System.Drawing.Font("Segoe UI", 12F);
this.flatButton1.Location = new System.Drawing.Point(74, 209);
this.flatButton1.Name = "flatButton1";
this.flatButton1.Rounded = false;
this.flatButton1.Size = new System.Drawing.Size(106, 32);
this.flatButton1.TabIndex = 11;
this.flatButton1.Text = "Login";
this.flatButton1.TextColor = System.Drawing.Color.FromArgb(((int)(((byte)(243)))), ((int)(((byte)(243)))), ((int)(((byte)(243)))));
//
// WelcomePage
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(256, 349);
this.Controls.Add(this.formSkin1);
this.FormBorderStyle = System.Windows.Forms.FormBorderStyle.None;
this.Name = "WelcomePage";
this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
this.Text = "Form1";
this.TransparencyKey = System.Drawing.Color.Fuchsia;
this.formSkin1.ResumeLayout(false);
this.formSkin1.PerformLayout();
this.ResumeLayout(false);
}
#endregion
private FlatUI.FormSkin formSkin1;
private FlatUI.FlatMini flatMini1;
private FlatUI.FlatMax flatMax1;
private FlatUI.FlatClose flatClose1;
private FlatUI.FlatTextBox flatTextBox2;
private FlatUI.FlatLabel flatLabel2;
private FlatUI.FlatTextBox flatTextBox1;
private FlatUI.FlatLabel flatLabel1;
private FlatUI.FlatButton flatButton1;
}
}
问题已解决！缺少点击检测代码！
您是否尝试在 if/else 块中设置断点？
这里有一些注意事项： 使用准备好的语句和参数化查询。永远不要根据用户输入创建动态 SQL，因为应用程序容易受到 SQL injection.
的攻击这是您使用参数化参数重写的代码：
SqlDataAdapter dataAdapter = new SqlDataAdapter("SELECT COUNT(*) FROM login WHERE Username=@Username AND Password=@Password", connection);
dataAdapter.SelectCommand.Parameters.AddWithValue("@Username", flatTextBox1.Text);
dataAdapter.SelectCommand.Parameters.AddWithValue("@Password", flatTextBox2.Text);
我没有看到任何事件处理程序附加到按钮的设计器代码应该是：
this.flatButton1.Click += new System.EventHandler(this.flatButton1_Click);
您必须定义一个事件处理程序并将代码放入其中
private void flatButton1_Click(object sender, EventArgs e)
{
//Your code here
}