为什么我listbox在删除选中项的时候会是未选中任何项？
我在进行listbox删除选中项的时候，明明选择了列表中的项，但是为什么Listbox1.SelectedIndex是-1，
有没有具体代码和界面啊？
这个是界面
``` private void button11_Click(object sender, EventArgs e)
{
if (Listbox1.SelectedItems.Count == 0)
{
MessageBox.Show("请选择要删除的图片");
}
else
{
//删除listbox中的文件名
//Listbox1.Items.Remove(Listbox1.SelectedItem);
List<object> list = new List<object>();
foreach (int i in Listbox1.SelectedIndices)
{
list.Add(Listbox1.Items[i]);
}
foreach (object i in list)
{
Listbox1.Items.Remove(i);
}
```这个是执行检测的部分
``` //执行检测
int kongzhi = 0;//判断是否执行检测的参数
public void button2_Click(object sender, EventArgs e)
{
kongzhi = 1;
bool i = Jiance();
string str1;
str1 = str;
if (i)
{
if (jiancemoshi)
{
label1.Text=label3.Text ="1";
HObject img = new HObject();
HOperatorSet.ReadImage(out img, imagestr);
img = Changesize(model, img);//按照模型对图像的要求修改图像尺寸
HTuple Width = new HTuple(), Height = new HTuple();
HOperatorSet.GetImageSize(img, out Width, out Height);
HOperatorSet.SetPart(hWindowControl1.HalconWindow, 0, 0, Height - 1, Width - 1);//按照图像大小定义显示窗口imagepart尺寸
List<Jiance.Xinxi> list = ceshi.RunHalconEx(hWindowControl1.HalconWindow, hWindowControl2.HalconWindow, model, img);//输入图像和模型进行检测，返回缺陷位置信息
int length = list.Count;
int numRow = dataGridView1.RowCount;
for (int j = 0; j < numRow - 1; j++)
{
dataGridView1.Rows.Remove(dataGridView1.Rows[0]);
}
for (int j = 0; j < length; j++)
{
dataGridView1.Rows.Add();
dataGridView1.Rows[j].Cells[0].Value = j + 1;
int id = list[j].class_id;
if (id == 1)
{
dataGridView1.Rows[j].Cells[1].Value = "孔洞";//TODO（依据返回数定义缺陷类型）
}
dataGridView1.Rows[j].Cells[2].Value = "(" + list[j].r_c1 + "," + list[j].r_r1 + ")";//在列表中显示起点坐标
dataGridView1.Rows[j].Cells[3].Value = "(" + list[j].r_c2 + "," + list[j].r_r2 + ")";//在列表中显示终点坐标
////////////////////////
dataGridView1.Rows[j].Cells[4].Value = str1;//在列表中显示分区结果
dataGridView1.Rows[j].Cells[5].Value = list[j].MaxDistance.D.ToString("0.0");
};
label4.Text = Listbox1.Items[0].ToString();
}
else
{
DirectoryInfo dir = new DirectoryInfo(str);
int num2 = GetFilesCount(dir);
label3.Text = num2.ToString();
int num1 = m + 1;
label1.Text = num1.ToString();
HObject img = new HObject();
HTuple Width = new HTuple(), Height = new HTuple();
HOperatorSet.ListFiles(str, "files", out hv_file);
HOperatorSet.ReadImage(out img, hv_file[0]);//读取图像
img = Changesize(model, img);//按照模型对图像的要求修改图像尺寸
HOperatorSet.GetImageSize(img, out Width, out Height);
HOperatorSet.SetPart(hWindowControl1.HalconWindow, 0, 0, Height - 1, Width - 1);//按照图像大小定义显示窗口imagepart尺寸
List<Jiance.Xinxi> list = ceshi.RunHalcon(hWindowControl1.HalconWindow, model, img);//输入图像和模型进行检测，返回缺陷位置信息
CurtXiaciList[m] = list;
int length = list.Count;
for (int j = 0; j < length; j++)
{
dataGridView1.Rows.Add();
dataGridView1.Rows[j].Cells[0].Value = j + 1;
int id = list[j].class_id;
if (id == 1)
{
dataGridView1.Rows[j].Cells[1].Value = "孔洞";//TODO（依据返回数定义缺陷类型）
}
dataGridView1.Rows[j].Cells[2].Value = "(" + list[j].r_c1 + "," + list[j].r_r1 + ")";//在列表中显示起点坐标
dataGridView1.Rows[j].Cells[3].Value = "(" + list[j].r_c2 + "," + list[j].r_r2 + ")";//在列表中显示终点坐标
}
button5.Enabled = true;
button4.Enabled = true;//开放前后按钮，可以对批处理图像进行
label4.Text = Listbox1.Items[0].ToString();
}
}
}
```这个是列表切换的部分
``` private void Listbox1_SelectedIndexChanged(object sender, EventArgs e)
{
label1.Text = Listbox1.SelectedIndex.ToString();
HObject img = new HObject();
if (kongzhi == 0)
{
//显示原图
HOperatorSet.ReadImage(out img, folderBrowserDialog1.SelectedPath + "\\" + Listbox1.SelectedIndex.ToString());
//img = Changesize(model, img);
label4.Text = Listbox1.SelectedIndex.ToString();
//HTuple Width = new HTuple(), Height = new HTuple();
//HOperatorSet.GetImageSize(img, out Width, out Height);
//HOperatorSet.SetPart(hWindowControl1.HalconWindow, 0, 0, Height - 1, Width - 1);
//List<Jiance.Xinxi> list = ceshi.RunHalcon(hWindowControl1.HalconWindow, model, img);
//CurtXiaciList[m] = list;
img.Dispose();
}
else
{
//显示处理后的图像，hv_file为检测后的目录和文件
HOperatorSet.ReadImage(out img, hv_file[Listbox1.SelectedIndex]);
img = Changesize(model, img);
label4.Text = Listbox1.SelectedIndex.ToString();
HTuple Width = new HTuple(), Height = new HTuple();
HOperatorSet.GetImageSize(img, out Width, out Height);
HOperatorSet.SetPart(hWindowControl1.HalconWindow, 0, 0, Height - 1, Width - 1);