我遇到以下异常：
无法将'System.Collections.Generic.List`1 [test.Form1 + comodity]'类型的对象强制转换为'System.Collections.Generic.List`1 [test.Form2 + comodity]'。
这一行：
comodityData = (List<comodity>)tf.Deserialize(ts);
我不知道为什么。我以前从未遇到过这个错误。任何人都可以帮助我吗？
完整的参考代码：
namespace test
{
public partial class Form2 : Form
{
public float Alligor;
public float Briochit;
public float Chollonin;
public float Espitium;
public float Hydrobenol;
public float Isopropenetol;
public float Metachropin;
public float Phlobotil;
public float Plasteosine;
public float Polynitrocol;
public float Polynucleit;
public float Prilumium;
public float Statchanol;
public float Titanium;
public float Vitricyl;
public float AlligorInput;
public float BriochitInput;
public float CholloninInput;
public float EspitiumInput;
public float HydrobenolInput;
public float IsopropenetolInput;
public float MetachropinInput;
public float PhlobotilInput;
public float PlasteosineInput;
public float PolynitrocolInput;
public float PolynucleitInput;
public float PrilumiumInput;
public float StatchanolInput;
public float TitaniumInput;
public float VitricylInput;
public float costofAlligor;
public float costofBriochit;
public float costofChollonin;
public float costofEspitium;
public float costofHydrobenol;
public float costofIsopropenetol;
public float costofMetachropin;
public float costofPhlobotil;
public float costofPlasteosine;
public float costofPolynitrocol;
public float costofPolynucleit;
public float costofPrilumium;
public float costofStatchanol;
public float costofTitanium;
public float costofVitricyl;
public double totalCost;
public class comodity
{
public float comodityPrice;
}
private List<comodity> comodityData = new List<comodity>();
private comodity o1 = null;
private comodity o2 = null;
private comodity o3 = null;
private comodity o4 = null;
private comodity o5 = null;
private comodity o6 = null;
private comodity o7 = null;
private comodity o8 = null;
private comodity o9 = null;
private comodity o10 = null;
private comodity o11 = null;
private comodity o12 = null;
private comodity o13 = null;
private comodity o14 = null;
private comodity o15 = null;
public Form2()
{
InitializeComponent();
o1 = new comodity();
o2 = new comodity();
o3 = new comodity();
o4 = new comodity();
o5 = new comodity();
o6 = new comodity();
o7 = new comodity();
o8 = new comodity();
o9 = new comodity();
o10 = new comodity();
o11 = new comodity();
o12 = new comodity();
o13 = new comodity();
o14 = new comodity();
o15 = new comodity();
comodityData.Add(o1);
comodityData.Add(o2);
comodityData.Add(o3);
comodityData.Add(o4);
comodityData.Add(o5);
comodityData.Add(o6);
comodityData.Add(o7);
comodityData.Add(o8);
comodityData.Add(o9);
comodityData.Add(o11);
comodityData.Add(o12);
comodityData.Add(o13);
comodityData.Add(o14);
comodityData.Add(o15);
FileStream ts = new FileStream("comoditys.dat", FileMode.Open);
BinaryFormatter tf = new BinaryFormatter();
comodityData = (List<comodity>)tf.Deserialize(ts);
ts.Close();
if (comodityData != null)
{
if (comodityData.Count > 0)
Alligor = comodityData[0].comodityPrice;
if (comodityData.Count > 1)
Briochit = comodityData[1].comodityPrice;
if (comodityData.Count > 2)
Chollonin = comodityData[2].comodityPrice;
if (comodityData.Count > 3)
Espitium = comodityData[3].comodityPrice;
if (comodityData.Count > 4)
Hydrobenol = comodityData[4].comodityPrice;
if (comodityData.Count > 5)
Isopropenetol = comodityData[5].comodityPrice;
if (comodityData.Count > 6)
Metachropin = comodityData[6].comodityPrice;
if (comodityData.Count > 7)
Phlobotil = comodityData[7].comodityPrice;
if (comodityData.Count > 8)
Plasteosine = comodityData[8].comodityPrice;
if (comodityData.Count > 9)
Polynitrocol = comodityData[9].comodityPrice;
if (comodityData.Count > 10)
Polynucleit = comodityData[10].comodityPrice;
if (comodityData.Count > 11)
Prilumium = comodityData[11].comodityPrice;
if (comodityData.Count > 12)
Statchanol = comodityData[12].comodityPrice;
if (comodityData.Count > 13)
Titanium = comodityData[13].comodityPrice;
if (comodityData.Count > 14)
Vitricyl = comodityData[14].comodityPrice;
}
}
private void textBox1_TextChanged(object sender, EventArgs e)
{
// 1st text box input is float
float tempFloat;
if (float.TryParse(textBox1.Text, out tempFloat))
{
AlligorInput = tempFloat;
}
else
MessageBox.Show("uh oh");
}
private void textBox2_TextChanged(object sender, EventArgs e)
{
// 1st text box input is float
float tempFloat;
if (float.TryParse(textBox1.Text, out tempFloat))
{
BriochitInput = tempFloat;
}
else
MessageBox.Show("uh oh");
}
private void textBox3_TextChanged(object sender, EventArgs e)
{
// 1st text box input is float
float tempFloat;
if (float.TryParse(textBox1.Text, out tempFloat))
{
CholloninInput = tempFloat;
}
else
MessageBox.Show("uh oh");
}
private void textBox4_TextChanged(object sender, EventArgs e)
{
// 1st text box input is float
float tempFloat;
if (float.TryParse(textBox1.Text, out tempFloat))
{
EspitiumInput = tempFloat;
}
else
MessageBox.Show("uh oh");
}
private void textBox5_TextChanged(object sender, EventArgs e)
{
// 1st text box input is float
float tempFloat;
if (float.TryParse(textBox1.Text, out tempFloat))
{
HydrobenolInput = tempFloat;
}
else
MessageBox.Show("uh oh");
}
private void textBox6_TextChanged(object sender, EventArgs e)
{
// 1st text box input is float
float tempFloat;
if (float.TryParse(textBox1.Text, out tempFloat))
{
IsopropenetolInput = tempFloat;
}
else
MessageBox.Show("uh oh");
}
private void textBox7_TextChanged(object sender, EventArgs e)
{
// 1st text box input is float
float tempFloat;
if (float.TryParse(textBox1.Text, out tempFloat))
{
MetachropinInput = tempFloat;
}
else
MessageBox.Show("uh oh");
}
private void textBox8_TextChanged(object sender, EventArgs e)
{
// 1st text box input is float
float tempFloat;
if (float.TryParse(textBox1.Text, out tempFloat))
{
PhlobotilInput = tempFloat;
}
else
MessageBox.Show("uh oh");
}
private void textBox9_TextChanged(object sender, EventArgs e)
{
// 1st text box input is float
float tempFloat;
if (float.TryParse(textBox1.Text, out tempFloat))
{
PlasteosineInput = tempFloat;
}
else
MessageBox.Show("uh oh");
}
private void textBox10_TextChanged(object sender, EventArgs e)
{
// 1st text box input is float
float tempFloat;
if (float.TryParse(textBox1.Text, out tempFloat))
{
PolynitrocolInput = tempFloat;
}
else
MessageBox.Show("uh oh");
}
private void textBox11_TextChanged(object sender, EventArgs e)
{
// 1st text box input is float
float tempFloat;
if (float.TryParse(textBox1.Text, out tempFloat))
{
PolynucleitInput = tempFloat;
}
else
MessageBox.Show("uh oh");
}
private void textBox12_TextChanged(object sender, EventArgs e)
{
// 1st text box input is float
float tempFloat;
if (float.TryParse(textBox1.Text, out tempFloat))
{
PrilumiumInput = tempFloat;
}
else
MessageBox.Show("uh oh");
}
private void textBox13_TextChanged(object sender, EventArgs e)
{
// 1st text box input is float
float tempFloat;
if (float.TryParse(textBox1.Text, out tempFloat))
{
StatchanolInput = tempFloat;
}
else
MessageBox.Show("uh oh");
}
private void textBox14_TextChanged(object sender, EventArgs e)
{
// 1st text box input is float
float tempFloat;
if (float.TryParse(textBox1.Text, out tempFloat))
{
TitaniumInput = tempFloat;
}
else
MessageBox.Show("uh oh");
}
private void textBox15_TextChanged(object sender, EventArgs e)
{
// 1st text box input is float
float tempFloat;
if (float.TryParse(textBox1.Text, out tempFloat))
{
VitricylInput = tempFloat;
}
else
MessageBox.Show("uh oh");
}
private void button1_Click(object sender, EventArgs e)
{
costofAlligor = Alligor * AlligorInput;
costofBriochit = Briochit * BriochitInput;
costofChollonin = Chollonin * CholloninInput;
costofEspitium = Espitium * EspitiumInput;
costofHydrobenol = Hydrobenol * HydrobenolInput;
costofIsopropenetol = Isopropenetol * IsopropenetolInput;
costofMetachropin = Metachropin * MetachropinInput;
costofPhlobotil = Phlobotil * PhlobotilInput;
costofPlasteosine = Plasteosine * PlasteosineInput;
costofPolynitrocol = Polynitrocol * PolynitrocolInput;
costofPolynucleit = Polynucleit * PolynucleitInput;
costofPrilumium = Prilumium * PrilumiumInput;
costofStatchanol = Statchanol * StatchanolInput;
costofTitanium = Titanium * TitaniumInput;
costofVitricyl = Vitricyl * VitricylInput;
totalCost = costofAlligor + costofBriochit + costofChollonin + costofEspitium + costofHydrobenol + costofIsopropenetol + costofMetachropin + costofPhlobotil + costofPlasteosine + costofPolynitrocol + costofPolynucleit + costofPrilumium + costofStatchanol + costofTitanium + costofVitricyl;
}
private void textBox16_TextChanged(object sender, EventArgs e)
{
textBox13.Text = totalCost.ToString();
}
}
}
答案 0 :(得分：3)
只定义一个类comodity，并在任何其他类之外执行此操作。
答案 1 :(得分：0)
简单的答案是你不能这样做！在C＃中，您无法将具有一种泛型类型的List转换为另一种类型。
此问题的一个简单解决方法是使用Cast Linq扩展方法：
List<Person> personlist = new List<Person>() { ... };
List<object> objectList = personlist.Cast<object>();