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Winfrom的ListBox行如何实现上移,下移,置顶,置底?

listboxWinForm

Shouchehomo - 1年前

• 
  Parfume - 1年前

  private void button1_Click(object sender, EventArgs e)
  {
  // 上移
  if (this.listBox1.SelectedIndices.Count > 0 &&
  this.listBox1.SelectedIndices[0] > 0)
  {
  int[] newIndices =
  this.listBox1.SelectedIndices.Cast<int>()
  .Select(index => index - 1).ToArray();
  
  this.listBox1.SelectedItems.Clear();
  
  for (int i = 0; i < newIndices.Length; i++)
  {
  object obj = this.listBox1.Items[newIndices[i]];
  this.listBox1.Items[newIndices[i]] = this.listBox1.Items[newIndices[i] + 1];
  this.listBox1.Items[newIndices[i] + 1] = obj;
  this.listBox1.SelectedItems.Add(this.listBox1.Items[newIndices[i]]);
  }
  }
  }
  
  private void button2_Click(object sender, EventArgs e)
  {
  // 下移
  if (this.listBox1.SelectedIndices.Count > 0 &&
  this.listBox1.SelectedIndices[this.listBox1.SelectedIndices.Count - 1] <
  this.listBox1.Items.Count - 1)
  {
  int[] newIndices =
  this.listBox1.SelectedIndices.Cast<int>()
  .Select(index => index + 1).ToArray();
  
  this.listBox1.SelectedItems.Clear();
  
  for (int i = newIndices.Length; i > 0; i--)
  {
  object obj = this.listBox1.Items[newIndices[i - 1]];
  this.listBox1.Items[newIndices[i - 1]] = this.listBox1.Items[newIndices[i - 1] - 1];
  this.listBox1.Items[newIndices[i - 1] - 1] = obj;
  this.listBox1.SelectedItems.Add(this.listBox1.Items[newIndices[i - 1]]);
  }
  }
  }
  
  private void button3_Click(object sender, EventArgs e)
  {
  // 置顶
  if (this.listBox1.SelectedIndices.Count > 0 &&
  this.listBox1.SelectedIndices[0] > 0)
  {
  int[] oldIndices =
  this.listBox1.SelectedIndices.Cast<int>().ToArray();
  
  int[] newIndices =
  this.listBox1.SelectedIndices.Cast<int>()
  .Select(index => index - 1).ToArray();
  
  int offest = oldIndices[0];
  
  while (offest-- > 0)
  {
  this.listBox1.SelectedItems.Clear();
  
  for (int i = 0; i < newIndices.Length; i++)
  {
  object obj = this.listBox1.Items[newIndices[i]];
  this.listBox1.Items[newIndices[i]] = this.listBox1.Items[newIndices[i] + 1];
  this.listBox1.Items[newIndices[i] + 1] = obj;
  this.listBox1.SelectedItems.Add(this.listBox1.Items[newIndices[i]]);
  }
  
  newIndices = newIndices.Select(index => index - 1).ToArray();
  }
  }
  }
  
  private void button4_Click(object sender, EventArgs e)
  {
  // 置末
  if (this.listBox1.SelectedIndices.Count > 0 &&
  this.listBox1.SelectedIndices[this.listBox1.SelectedIndices.Count - 1] <
  this.listBox1.Items.Count - 1)
  {
  int[] oldIndices =
  this.listBox1.SelectedIndices.Cast<int>().ToArray();
  
  int[] newIndices =
  this.listBox1.SelectedIndices.Cast<int>()
  .Select(index => index + 1).ToArray();
  
  int offest = oldIndices[oldIndices.Length - 1];
  
  while (offest++ < this.listBox1.Items.Count - 1)
  {
  this.listBox1.SelectedItems.Clear();
  
  for (int i = newIndices.Length; i > 0; i--)
  {
  object obj = this.listBox1.Items[newIndices[i - 1]];
  this.listBox1.Items[newIndices[i - 1]] = this.listBox1.Items[newIndices[i - 1] - 1];
  this.listBox1.Items[newIndices[i - 1] - 1] = obj;
  this.listBox1.SelectedItems.Add(this.listBox1.Items[newIndices[i - 1]]);
  }
  
  newIndices = newIndices.Select(index => index + 1).ToArray();
  }
  }
  }