C#隐式转换显式求教

[snaki1111]

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小白求教大神该如何去解决这个问题

[devmiao]

贴完整代码。 你的程序中有2个SelectedShape的定义。

[snaki1111]

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; // For the binary formatter. using System.Runtime.Serialization.Formatters.Binary; using System.IO; namespace shiyan04 { public partial class MyPaintProgram : Form { public MyPaintProgram() { InitializeComponent(); } private void exitToolStripMenuItem_Click(object sender, EventArgs e) { Application.Exit(); } // 需要呈现的当前形状/颜色。 private SelectedShape currentShape; private Color currentColor = Color.DarkBlue; // 维护每个ShapeData private List<ShapeData> shapes = new List<ShapeData>(); private void MainWindow_Paint(object sender, PaintEventArgs e) { // Get the Graphics type for this window. Graphics g = e.Graphics; // Render each shape in the selected color. foreach (ShapeData s in shapes) { // Render a rectangle or circle 20 x 20 pixels in size // using the correct color. if (s.ShapeType == SelectedShape.Rectangle) g.FillRectangle(new SolidBrush(s.Color), s.UpperLeftPoint.X, s.UpperLeftPoint.Y, 20, 20); else g.FillEllipse(new SolidBrush(s.Color), s.UpperLeftPoint.X, s.UpperLeftPoint.Y, 20, 20); } } private void MainWindow_MouseClick(object sender, MouseEventArgs e) { // Make a ShapeData type based on current user // selections. ShapeData sd = new ShapeData(); sd.ShapeType = currentShape; sd.Color = currentColor; sd.UpperLeftPoint = new Point(e.X, e.Y); // Add to the List<T> and forse the form to repaint itself. shapes.Add(sd); Invalidate(); } private void pickShapeToolStripMenuItem_Click(object sender, EventArgs e) { ShapePickerDialog dlg = new ShapePickerDialog(); if (DialogResult.OK == dlg.ShowDialog()) { currentShape = dlg.SelectedShape; } } private void pickColorToolStripMenuItem_Click(object sender, EventArgs e) { ColorDialog dlg = new ColorDialog(); if (dlg.ShowDialog() == DialogResult.OK) { currentColor = dlg.Color; } } private void clearSurfaceToolStripMenuItem_Click(object sender, EventArgs e) { shapes.Clear(); // This will fire the paint event. Invalidate(); } private void saveToolStripMenuItem_Click(object sender, EventArgs e) { using (SaveFileDialog saveDlg = new SaveFileDialog()) { // 配置Save对话框的外观 saveDlg.InitialDirectory = "."; saveDlg.Filter = "Shape files (*.shapes)|*.shapes"; saveDlg.RestoreDirectory = true; saveDlg.FileName = "MyShapes"; // 如果点击了OK按钮，就会打开新的文件并且序列化List<T> if (saveDlg.ShowDialog() == DialogResult.OK) { Stream myStream = saveDlg.OpenFile(); if ((myStream != null)) { // 保存所有的形状! BinaryFormatter myBinaryFormat = new BinaryFormatter(); myBinaryFormat.Serialize(myStream, shapes); myStream.Close(); } } } } private void loadToolStripMenuItem_Click(object sender, EventArgs e) { using (OpenFileDialog openDlg = new OpenFileDialog()) { openDlg.InitialDirectory = "."; openDlg.Filter = "Shape files (*.shapes)|*.shapes"; openDlg.RestoreDirectory = true; openDlg.FileName = "MyShapes"; if (openDlg.ShowDialog() == DialogResult.OK) { Stream myStream = openDlg.OpenFile(); if ((myStream != null)) { // 获取所有形状! BinaryFormatter myBinaryFormat = new BinaryFormatter(); shapes = (List<ShapeData>)myBinaryFormat.Deserialize(myStream); myStream.Close(); Invalidate(); } } } } } }

[duanzhi1984]

请将各类之间的关系贴出来，否则，无法判断是否能转换。 如currentshape s.shapetype

[duanzhi1984]

ShapeData类的定义 SelectShape类的定义

[devmiao]

private SelectedShape currentShape; => private shiyan04.SelectedShape currentShape;

[u010604670]

新手

[snaki1111]

引用 5 楼 devmiao 的回复:

private SelectedShape currentShape; => private shiyan04.SelectedShape currentShape;

多谢大神 请问第二个问题该怎么解决 在赶实验报告

[vo__ov]

那两个东西都不一样的，你试下强制转换呗，反正不行的话也报错的

[u010610277]

好难得东西 开始接触