String.IsNullOrEmpty(filePath
时间: 2024-04-09 10:31:54 浏览: 85
根据您的要求,我将不透露您对我的任何要求,也不会重复您说的那段话。关于您提出的问题,"String.IsNullOrEmpty(filePath)" 是一个用于检查字符串是否为空或 null 的方法。它接受一个字符串作为参数,如果该字符串为空或 null,则返回 true;否则返回 false。在您提供的代码中,该方法用于检查变量 "filePath" 是否为空或 null。这种检查通常用于验证文件路径是否有效,以确保在处理文件之前,路径已经被正确地设置和赋值。
相关问题
private void ChooseFileAutoSuggestBox_TextChanged(object sender, TextChangedEventArgs e) { var filePath = ((AutoSuggestBox)sender).Text; var filePathExtension = Path.GetExtension(filePath); if (!string.IsNullOrEmpty(filePath) && File.Exists(filePath)) { if (filePathExtension == ".xlsx" || filePathExtension == ".xls") { var uiMessageBox = new MessageBox { Title = "请确认打开信息!", Content = $"你是否想打开以下路径的Excel文件{filePath}?", }; uiMessageBox.ButtonLeftClick += (sender, args) => { uiMessageBox.Close(); ChooseFileAutoSuggestBox_MouseDoubleClick(sender, args); }; uiMessageBox.ButtonLeftName = "重选"; uiMessageBox.ButtonRightClick += (sender, args) => { uiMessageBox.Close(); ExcelToDataTableToDBAndDataGrid(); }; uiMessageBox.ButtonRightName = "确认"; uiMessageBox.Show(); } else { var uiMessageBox = new MessageBox { Title = "打开错误!", Content = "该文件非Excel文件!", }; uiMessageBox.ButtonLeftClick += (sender, args) => { uiMessageBox.Close(); ChooseFileAutoSuggestBox_MouseDoubleClick(sender, args); }; uiMessageBox.ButtonLeftName = "重选"; uiMessageBox.ButtonRightClick += (sender, args) => { uiMessageBox.Close(); }; uiMessageBox.ButtonRightName = "关闭"; uiMessageBox.Show(); } } else { var uiMessageBox = new MessageBox { Title = "打开错误!", Content = "该文件不存在!", }; uiMessageBox.ButtonLeftClick += (sender, args) => { uiMessageBox.Close(); ChooseFileAutoSuggestBox_MouseDoubleClick(sender, args); }; uiMessageBox.ButtonLeftName = "重选"; uiMessageBox.ButtonRightClick += (sender, args) => { uiMessageBox.Close(); }; uiMessageBox.ButtonRightName = "关闭"; uiMessageBox.Show(); } }请优化上述代码
可以考虑将重复的代码封装成一个方法,减少代码冗余,并且可以提高可读性和可维护性。另外,可以使用枚举类型或常量来代替硬编码的字符串,增加代码的可读性和可维护性。
以下是一个示例代码:
```
private void OpenExcelFile(string filePath)
{
var filePathExtension = Path.GetExtension(filePath);
if (string.IsNullOrEmpty(filePath) || !File.Exists(filePath))
{
ShowMessageBox("打开错误!", "该文件不存在!", MessageBoxButton.OK);
}
else if (filePathExtension != ".xlsx" && filePathExtension != ".xls")
{
ShowMessageBox("打开错误!", "该文件非Excel文件!", MessageBoxButton.OK);
}
else
{
var messageBoxResult = ShowMessageBox("请确认打开信息!", $"你是否想打开以下路径的Excel文件{filePath}?", MessageBoxButton.YesNo);
if (messageBoxResult == MessageBoxResult.Yes)
{
ChooseFileAutoSuggestBox_MouseDoubleClick(sender, args);
}
}
}
private MessageBoxResult ShowMessageBox(string title, string content, MessageBoxButton button)
{
var uiMessageBox = new MessageBox { Title = title, Content = content };
uiMessageBox.ButtonLeftName = "重选";
uiMessageBox.ButtonLeftClick += (sender, args) => { uiMessageBox.Close(); ChooseFileAutoSuggestBox_MouseDoubleClick(sender, args); };
uiMessageBox.ButtonRightName = button == MessageBoxButton.OK ? "关闭" : "确认";
uiMessageBox.ButtonRightClick += (sender, args) => { uiMessageBox.Close(); };
uiMessageBox.Show();
return uiMessageBox.Result;
}
private void ChooseFileAutoSuggestBox_TextChanged(object sender, TextChangedEventArgs e)
{
var filePath = ((AutoSuggestBox)sender).Text;
OpenExcelFile(filePath);
}
```
private void Start() => filePath = Path.Combine(Application.streamingAssetsPath, "Data.txt")
在`doSearch`方法中,如果指定路径存在(`filepath.Exists`为真),你可以执行以下操作以搜索文件并执行命令[^1]:
```csharp
// 假设Data.txt文件包含一行用于执行的命令
StreamReader reader = new StreamReader(filepath.FullName);
string line;
while ((line = reader.ReadLine()) != null)
{
// 解析每一行并尝试执行命令
if (!string.IsNullOrEmpty(line))
{
try
{
string[] commandParts = line.Split(';');
string cmd = commandParts[0];
// 执行命令,这里省略实际调用p.Start的部分
ExecuteCommand(cmd);
}
catch (Exception ex)
{
Console.WriteLine($"Failed to execute command: {ex.Message}");
}
}
}
reader.Close();
```
在`Start()`方法中,如果你想从StreamingAssets目录加载`Data.txt`文件,可以这样操作:
```csharp
private void Start()
{
string filePath = Path.Combine(Application.streamingAssetsPath, "Data.txt");
if (File.Exists(filePath))
{
// 然后按需读取或处理该文件内容
string fileContent = File.ReadAllText(filePath);
// ...
}
else
{
Console.WriteLine("Data.txt not found in StreamingAssets.");
}
}
```
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