خطای : Unable to cast object of type 'System.Windows.Forms.TextBox' to type 'System.IConvertible'.

[mahmata]

سلام
برنامه رو وقتی رو اجرا میکنم و دکمه ی اجرا رو میزنم باید خروجی رو در یک تکست باکس نمایش بده ولی این خطا رو میده
Unable to cast object of type 'System.Windows.Forms.TextBox' to type 'System.IConvertible'


(http://www.codeproject.com/Questions/554909/Unableplustopluscastplusobjectplusofplustypeplus)
دلیلش چیه؟ :ناراحت:
البته اینم بگم که برنامه ی من محاسباتی هست و ورودی هایی که از تکست باکس ها گرفتم رو در برنامه به double تبدیل کردم. نمیدونم خودم احساس میکنم دلیلش شاید این باشه! چیکار کنم؟:افسرده:

[sh]

خطا مربوط به تبدیل یک type به نوع دیگر است که باید کد های نوشته شده را بگذاری تا بتوان کد حاوی خطا را تشخیص داد

[mahmata]

اینم کدم
خواهشا کمکم کنید :ناراحت:

using System;using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;


namespace finalproject
{
public partial class Form4 : Form
{
public Form4()
{
InitializeComponent();
}


private void button2_Click(object sender, EventArgs e)
{
double a = 0;
double b = 0;
double c = 0;
double d = 0;
double Sigma_z = 0;//meter
double Sigma_y = 0;//meter
string StabilityCat = "";
double x_meter = Convert.ToDouble(textBox8.Text);
double x_kilometer = x_meter / 1000;
double WindSpeed = Convert.ToDouble(textBox7.Text);
double gas_Exit_Velocity = Convert.ToDouble(textBox2);
double Pressure = Convert.ToDouble(textBox11.Text);
double air_tempreture = Convert.ToDouble(textBox6.Text);
double stack_tempreture = Convert.ToDouble(textBox3.Text);
double Concentration = 0;
double Q = Convert.ToDouble(textBox5.Text); // Emission Rate
double Pi = Math.PI;
double e_constant = Math.E;
double y = Convert.ToDouble(textBox9.Text);
double z = Convert.ToDouble(textBox10.Text);


//***************************
double h_stack = Convert.ToDouble(textBox10.Text);
double Stack_Diameter = Convert.ToDouble(textBox4.Text) ;


if (gas_Exit_Velocity < 1.5 * WindSpeed)
h_stack = h_stack + 2 * Stack_Diameter * ((gas_Exit_Velocity / WindSpeed) - 1.5);

//***************delta h ****************
/// Plume rise
double delta_h = ((gas_Exit_Velocity * Stack_Diameter) / WindSpeed) * (1.5 + ((2.68 / 1000) * Pressure * ((stack_tempreture - air_tempreture) / stack_tempreture) * Stack_Diameter));


//********************* H ***************
/// effective stack height
double H = h_stack + delta_h;

if (WindSpeed < 2 && comboBox1.Text == "Day")
{


if (comboBox2.Text == "Strong")
StabilityCat = "A";
if (comboBox2.Text == "Moderate to strong")
StabilityCat = "A";
if (comboBox2.Text == "Moderate to slight")
StabilityCat = "B";
if (comboBox2.Text == "Slight")
StabilityCat = "B";
}
if (WindSpeed >= 2 && WindSpeed < 3 && comboBox1.Text == "Day")
{
if (comboBox2.Text == "Strong")
StabilityCat = "A";
if (comboBox2.Text == "Moderate to strong")
StabilityCat = "B";
if (comboBox2.Text == "Moderate to slight")
StabilityCat = "B";
if (comboBox2.Text == "Slight")
StabilityCat = "C";


}
if (WindSpeed >= 3 && WindSpeed < 5 && comboBox1.Text == "Day")
{
if (comboBox2.Text == "Strong")
StabilityCat = "B";
if (comboBox2.Text == "Moderate to strong")
StabilityCat = "B";
if (comboBox2.Text == "Moderate to slight")
StabilityCat = "C";
if (comboBox2.Text == "Slight")
StabilityCat = "C";
}
if (WindSpeed >= 5 && WindSpeed < 6 && comboBox1.Text == "Day")
{
if (comboBox2.Text == "Strong")
StabilityCat = "C";
if (comboBox2.Text == "Moderate to strong")
StabilityCat = "C";
if (comboBox2.Text == "Moderate to slight")
StabilityCat = "D";
if (comboBox2.Text == "Slight")
StabilityCat = "D";
}
if (WindSpeed >= 6 && comboBox1.Text == "Day")
{
if (comboBox2.Text == "Strong")
StabilityCat = "C";
if (comboBox2.Text == "Moderate to strong")
StabilityCat = "D";
if (comboBox2.Text == "Moderate to slight")
StabilityCat = "D";
if (comboBox2.Text == "Slight")
StabilityCat = "D";
}
if (WindSpeed < 2 && comboBox1.Text == "Night")
{
if (comboBox3.Text == "Smooth")
StabilityCat = "F";
if (comboBox3.Text == "Cloudiness")
StabilityCat = "F";
}
if (WindSpeed >= 2 && WindSpeed < 3 && comboBox1.Text == "Night")
{
if (comboBox3.Text == "Smooth")
StabilityCat = "F";
if (comboBox3.Text == "Cloudiness")
StabilityCat = "E";
}
if (WindSpeed >= 3 && WindSpeed < 5 && comboBox1.Text == "Night")
{
if (comboBox3.Text == "Smooth")
StabilityCat = "E";
if (comboBox3.Text == "Cloudiness")
StabilityCat = "D";
}
if (WindSpeed >= 5 && WindSpeed < 6 && comboBox1.Text == "Night")
{
if (comboBox3.Text == "Smooth")
StabilityCat = "D";
if (comboBox3.Text == "Cloudiness")
StabilityCat = "D";
}
if (WindSpeed >= 6 && comboBox1.Text == "Night")
{
if (comboBox3.Text == "Smooth")
StabilityCat = "D";
if (comboBox3.Text == "Cloudiness")
StabilityCat = "D";
}



if (comboBox5.Text == "Pasquill-Gifford")
{
//



if (StabilityCat == "A")
{
c = 24.1670;
d = 2.5334;
if (x_kilometer < 0.10) { a = 122.800; b = 0.94470; }


if (x_kilometer >= 0.10 && x_kilometer <= 0.15) { a = 158.080; b = 1.05420; }


if (x_kilometer >= 0.16 && x_kilometer <= 0.20) { a = 170.220; b = 1.09320; }


if (x_kilometer >= 0.21 && x_kilometer <= 0.25) { a = 179.520; b = 1.12620; }


if (x_kilometer >= 0.26 && x_kilometer <= 0.30) { a = 217.410; b = 1.26440; }


if (x_kilometer >= 0.31 && x_kilometer <= 0.40) { a = 258.890; b = 1.40940; }


if (x_kilometer >= 0.41 && x_kilometer <= 0.5) { a = 346.750; b = 1.72830; }


if (x_kilometer >= 0.51 && x_kilometer <= 3.11) { a = 453.850; b = 2.11660; }

if (x_kilometer > 3.11) { Sigma_z = 5000; }



Sigma_z = (a * Math.Pow(x_kilometer, b)) * 1000;
if (Sigma_z > 5000) Sigma_z = 5000;


Sigma_y = (c * Math.Pow(x_kilometer, d)) * 1000;


}
if (StabilityCat == "B")
{
c = 18.3330;
d = 1.8096;
if (x_kilometer <= 0.20) { a = 90.673; b = 0.93198; }
if (x_kilometer >= 0.21 && x_kilometer <= 0.40) { a = 98.483; b = 0.98332; }
if (x_kilometer > 0.40) { a = 109.300; b = 1.09710; }


Sigma_z = (a * Math.Pow(x_kilometer, b)) * 1000;
if (Sigma_z > 5000) Sigma_z = 5000;


Sigma_y = (c * Math.Pow(x_kilometer, d)) * 1000;
}
if (StabilityCat == "C")
{
c = 12.5000;
d = 1.0857;
a = 61.141;
b = 0.91465;


Sigma_z = (a * Math.Pow(x_kilometer, b)) * 1000;
if (Sigma_z > 5000) Sigma_z = 5000;


Sigma_y = (c * Math.Pow(x_kilometer, d)) * 1000;
}
if (StabilityCat == "D")
{
c = 8.3330;
d = 0.72382;
if (x_kilometer <= 0.30) { a = 34.459; b = 0.86974; }
if (x_kilometer >= 0.31 && x_kilometer <= 1.00) { a = 32.093; b = 0.81066; }
if (x_kilometer >= 1.01 && x_kilometer <= 3.00) { a = 32.093; b = 0.64403; }
if (x_kilometer >= 3.01 && x_kilometer <= 10.00) { a = 33.504; b = 0.60486; }
if (x_kilometer >= 10.01 && x_kilometer <= 30.00) { a = 36.650; b = 0.56589; }
if (x_kilometer > 30.00) { a = 44.053; b = 0.51179; }


Sigma_z = (a * Math.Pow(x_kilometer, b)) * 1000;


Sigma_y = (c * Math.Pow(x_kilometer, d)) * 1000;
}
if (StabilityCat == "E")
{
c = 6.2500;
d = 0.54287;
if (x_kilometer < 0.10) { a = 24.260; b = 0.83660; }
if (x_kilometer >= 0.10 && x_kilometer <= 0.30) { a = 23.331; b = 0.81956; }
if (x_kilometer >= 0.31 && x_kilometer <= 1.00) { a = 21.628; b = 0.75660; }
if (x_kilometer >= 1.01 && x_kilometer <= 2.00) { a = 21.628; b = 0.63077; }
if (x_kilometer >= 2.01 && x_kilometer <= 4.00) { a = 22.534; b = 0.57154; }
if (x_kilometer >= 4.01 && x_kilometer <= 10.00) { a = 24.703; b = 0.50527; }
if (x_kilometer >= 10.01 && x_kilometer <= 20.00) { a = 26.970; b = 0.46713; }
if (x_kilometer >= 20.01 && x_kilometer <= 40.00) { a = 35.420; b = 0.37615; }
if (x_kilometer > 40.00) { a = 47.618; b = 0.29592; }


Sigma_z = (a * Math.Pow(x_kilometer, b)) * 1000;

Sigma_y = (c * Math.Pow(x_kilometer, d)) * 1000;
}
if (StabilityCat == "F")
{
c = 4.1667;
d = 0.36191;
if (x_kilometer < 0.20) { a = 15.209; b = 0.81558; }
if (x_kilometer >= 0.21 && x_kilometer <= 0.70) { a = 14.457; b = 0.87407; }
if (x_kilometer >= 0.71 && x_kilometer <= 1.00) { a = 13.953; b = 0.68465; }
if (x_kilometer >= 1.01 && x_kilometer <= 2.00) { a = 13.953; b = 0.63227; }
if (x_kilometer >= 2.01 && x_kilometer <= 3.00) { a = 14.823; b = 0.54503; }
if (x_kilometer >= 3.01 && x_kilometer <= 7.00) { a = 16.187; b = 0.46490; }
if (x_kilometer >= 7.01 && x_kilometer <= 15.00) { a = 17.836; b = 0.41507; }
if (x_kilometer >= 15.01 && x_kilometer <= 30.00) { a = 22.651; b = 0.32681; }
if (x_kilometer >= 30.01 && x_kilometer <= 60.00) { a = 27.074; b = 0.27436; }
if (x_kilometer > 60.00) { a = 34.219; b = 0.21716; }


Sigma_z = (a * Math.Pow(x_kilometer, b)) * 1000;


Sigma_y = (c * Math.Pow(x_kilometer, d)) * 1000;
}
}
else
{
if (StabilityCat == "A") {


Sigma_y = 0.32 * x_meter * Math.Pow((1.0 + 0.0004 * x_meter), -0.5);
Sigma_z = 0.24 * x_meter * Math.Pow((1.0 + 0.001 * x_meter), 0.5);
}
if (StabilityCat == "B")
{


Sigma_y = 0.32 * x_meter * Math.Pow((1.0 + 0.0004 * x_meter), -0.5);
Sigma_z = 0.24 * x_meter * Math.Pow((1.0 + 0.001 * x_meter), 0.5);
}
if (StabilityCat == "C")
{


Sigma_y = 0.22 * x_meter * Math.Pow((1.0 + 0.0004 * x_meter), -0.5);
Sigma_z = 0.20 * x_meter;
}
if (StabilityCat == "D")
{


Sigma_y = 0.16 * x_meter * Math.Pow((1.0 + 0.0004 * x_meter), -0.5);
Sigma_z = 0.14 * x_meter * Math.Pow((1.0 + 0.003 * x_meter), -0.5);
}
if (StabilityCat == "E")
{


Sigma_y = 0.11 * x_meter * Math.Pow((1.0 + 0.0004 * x_meter), -0.5);
Sigma_z = 0.08 * x_meter * Math.Pow((1.0 + 0.015 * x_meter), 0.5);
}
if (StabilityCat == "B")
{


Sigma_y = 0.11 * x_meter * Math.Pow((1.0 + 0.0004 * x_meter), -0.5);
Sigma_z = 0.08 * x_meter * Math.Pow((1.0 + 0.015 * x_meter), -0.5);
}
}



if (comboBox4.Text == "With reflection")
{
Concentration = (Q / (2 * Pi * WindSpeed * Sigma_y * Sigma_z)) *
(Math.Pow(e_constant, (-0.5 * Math.Pow(y / Sigma_y, 2)))) *
((Math.Pow(e_constant, (-0.5 * Math.Pow((z - H) / Sigma_z, 2)))) + (Math.Pow(e_constant, (-0.5 * Math.Pow((z - H) / Sigma_z, 2)))));


textBox17.Text = Convert.ToString(Concentration);
}
textBox17.Text = Convert.ToString(Concentration);


}







}
}

[plus]

double gas_Exit_Velocity = Convert.ToDouble(textBox2);

Text. رو جا گذاشتین.
وقتی یک چنین خطایی گرفته میشه خطش رو هم به شما نشون میده کمی دقت کنید راحت متوجه میشین مشکل از چیه...

[mahmata]

عجبا! ببخشید واقعا نمیدونم چرا دقت نکردم :لبخند:
اجرا شد :خجالت: