先锋电视 苏宁 关系:懂C#的高手请进来！！！

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

namespace 方程
{
/// <summary>
/// Form1 的摘要说明。
/// </summary>
public class Form1 : System.Windows.Forms.Form
{
private System.Windows.Forms.Button button1;
private System.Windows.Forms.Label label1;
private System.Windows.Forms.Label label2;
private System.Windows.Forms.TextBox textBox1;
private System.Windows.Forms.TextBox textBox2;
private System.Windows.Forms.TextBox textBox3;
private System.Windows.Forms.TextBox textBox4;
private System.Windows.Forms.Label label3;
private System.Windows.Forms.Label label4;
private System.Windows.Forms.TextBox textBox5;
/// <summary>
/// 必需的设计器变量。
/// </summary>
private System.ComponentModel.Container components = null;

public Form1()
{
//
// Windows 窗体设计器支持所必需的
//
InitializeComponent();

//
// TODO: 在 InitializeComponent 调用后添加任何构造函数代码
//
}

/// <summary>
/// 清理所有正在使用的资源。
/// </summary>
protected override void Dispose( bool disposing )
{
if( disposing )
{
if (components != null)
{
components.Dispose();
}
}
base.Dispose( disposing );
}

#region Windows 窗体设计器生成的代码
/// <summary>
/// 设计器支持所需的方法 - 不要使用代码编辑器修改
/// 此方法的内容。
/// </summary>
private void InitializeComponent()
{
this.button1 = new System.Windows.Forms.Button();
this.label1 = new System.Windows.Forms.Label();
this.label2 = new System.Windows.Forms.Label();
this.textBox1 = new System.Windows.Forms.TextBox();
this.textBox2 = new System.Windows.Forms.TextBox();
this.textBox3 = new System.Windows.Forms.TextBox();
this.textBox4 = new System.Windows.Forms.TextBox();
this.label3 = new System.Windows.Forms.Label();
this.label4 = new System.Windows.Forms.Label();
this.textBox5 = new System.Windows.Forms.TextBox();
this.SuspendLayout();
//
// button1
//
this.button1.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
this.button1.Location = new System.Drawing.Point(296, 208);
this.button1.Name = "button1";
this.button1.TabIndex = 5;
this.button1.Text = "求x";
this.button1.Click += new System.EventHandler(this.button1_Click);
//
// label1
//
this.label1.Font = new System.Drawing.Font("宋体", 12F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
this.label1.Location = new System.Drawing.Point(104, 72);
this.label1.Name = "label1";
this.label1.Size = new System.Drawing.Size(72, 23);
this.label1.TabIndex = 1;
this.label1.Text = "*x*x+";
//
// label2
//
this.label2.Font = new System.Drawing.Font("宋体", 12F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
this.label2.Location = new System.Drawing.Point(320, 72);
this.label2.Name = "label2";
this.label2.Size = new System.Drawing.Size(64, 23);
this.label2.TabIndex = 2;
this.label2.Text = "*x+";
//
// textBox1
//
this.textBox1.BackColor = System.Drawing.SystemColors.Window;
this.textBox1.Font = new System.Drawing.Font("宋体", 10.5F, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
this.textBox1.ForeColor = System.Drawing.SystemColors.WindowText;
this.textBox1.Location = new System.Drawing.Point(8, 72);
this.textBox1.Name = "textBox1";
this.textBox1.Size = new System.Drawing.Size(80, 23);
this.textBox1.TabIndex = 3;
this.textBox1.Text = "";
this.textBox1.TextAlign = System.Windows.Forms.HorizontalAlignment.Right;
//
// textBox2
//
this.textBox2.BackColor = System.Drawing.SystemColors.Window;
this.textBox2.ForeColor = System.Drawing.SystemColors.WindowText;
this.textBox2.Location = new System.Drawing.Point(192, 72);
this.textBox2.Name = "textBox2";
this.textBox2.TabIndex = 4;
this.textBox2.Text = "";
this.textBox2.TextAlign = System.Windows.Forms.HorizontalAlignment.Right;
//
// textBox3
//
this.textBox3.BackColor = System.Drawing.SystemColors.Window;
this.textBox3.ForeColor = System.Drawing.SystemColors.WindowText;
this.textBox3.Location = new System.Drawing.Point(400, 72);
this.textBox3.Name = "textBox3";
this.textBox3.TabIndex = 5;
this.textBox3.Text = "";
this.textBox3.TextAlign = System.Windows.Forms.HorizontalAlignment.Right;
//
// textBox4
//
this.textBox4.Location = new System.Drawing.Point(568, 72);
this.textBox4.Name = "textBox4";
this.textBox4.ReadOnly = true;
this.textBox4.Size = new System.Drawing.Size(24, 21);
this.textBox4.TabIndex = 6;
this.textBox4.Text = "0";
//
// label3
//
this.label3.Font = new System.Drawing.Font("宋体", 12F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
this.label3.Location = new System.Drawing.Point(520, 72);
this.label3.Name = "label3";
this.label3.Size = new System.Drawing.Size(32, 23);
this.label3.TabIndex = 7;
this.label3.Text = "=";
//
// label4
//
this.label4.Font = new System.Drawing.Font("宋体", 9F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((System.Byte)(134)));
this.label4.Location = new System.Drawing.Point(232, 160);
this.label4.Name = "label4";
this.label4.Size = new System.Drawing.Size(56, 23);
this.label4.TabIndex = 8;
this.label4.Text = "x的值为";
//
// textBox5
//
this.textBox5.Location = new System.Drawing.Point(320, 144);
this.textBox5.Multiline = true;
this.textBox5.Name = "textBox5";
this.textBox5.ReadOnly = true;
this.textBox5.Size = new System.Drawing.Size(136, 40);
this.textBox5.TabIndex = 9;
this.textBox5.Text = "";
//
// Form1
//
this.AutoScaleBaseSize = new System.Drawing.Size(6, 14);
this.ClientSize = new System.Drawing.Size(632, 270);
this.Controls.Add(this.textBox5);
this.Controls.Add(this.label4);
this.Controls.Add(this.label3);
this.Controls.Add(this.textBox4);
this.Controls.Add(this.textBox3);
this.Controls.Add(this.textBox2);
this.Controls.Add(this.textBox1);
this.Controls.Add(this.label2);
this.Controls.Add(this.label1);
this.Controls.Add(this.button1);
this.Name = "Form1";
this.Text = "Form1";
this.ResumeLayout(false);

}
#endregion

/// <summary>
/// 应用程序的主入口点。
/// </summary>
[STAThread]
static void Main()
{
Application.Run(new Form1());
}

private void button1_Click(object sender, System.EventArgs e)
{
try
{
double a=double.Parse(textBox1.Text);
double b=double.Parse(textBox2.Text);
double c=double.Parse(textBox3.Text);

double dt=b*b-4*a*c;
if(dt<0)
textBox5.Text="该方程无解";
else if(a==0)
{
double g1=-c/b;
textBox5.Text=g1.ToString();
}
else
{

double Sdt=Math.Sqrt(dt);
double g1=(Sdt-b)/(2*a);
double g2=-(Sdt+b)/(2*a);
if (g1==g2)
textBox5.Text=g1.ToString();
else
textBox5.Text=g1.ToString()+"\n或"+g2.ToString();
}
}
catch(FormatException)
{
MessageBox.Show("请输入数字","错误");
}
}

}
}

高手都不编这个,不是不会,是丢不起那个人.