Question

我正在使用此代码在目录中搜索具有某些参数的文件，尽管其中一些可以留空，因此＆＃39; ||＆＃39;在代码中。我们正在使用Linq函数。

private void btnSearch_Click(object sender, EventArgs e)
        {
System.IO.DirectoryInfo dir = new System.IO.DirectoryInfo(@"c:\Work\TestDirectory");
IEnumerable<System.IO.FileInfo> fileList = dir.GetFiles("*.*", System.IO.SearchOption.AllDirectories);


string stringSearch = string.Empty;
//string stringSearch = "test";

DateTime? dateSearch = null;
//DateTime? dateSearch = new DateTime(2016, 1, 1);

string fileType = string.Empty;
//string fileType = ".txt";

IEnumerable<System.IO.FileInfo>
fileQuery =
from file in fileList
where (
//Search value for name is NULL or FileName contains the search string
(string.IsNullOrEmpty(stringSearch) || file.Name.Contains(stringSearch))

//AND Search date is null or File Last Access time was before search date
&& ((!dateSearch.HasValue) || file.LastAccessTime < dateSearch.Value)

//AND Search file type is null or File extension = search type
&& (string.IsNullOrEmpty(fileType) || file.Extension.Equals(fileType))

//Modified before
&& ((!dateSearch.HasValue) || file.LastWriteTime < dateSearch.Value)

//Modified After
&& ((!dateSearch.HasValue) || file.LastWriteTime > dateSearch.Value)

//etc
)
orderby file.Name
select file;

//Execute the query. 
foreach (System.IO.FileInfo fi in fileQuery) ;
{
listBox1.Items.Add(fileList);
}

        }
    }
}

当我点击我的搜索按钮时，我得到＆＃34; fileInfo [] array＆＃34;在我的列表框中。任何人都可以帮我解释为什么会这样？感谢

Answer 1

使用.Add()添加单个项目

listbox1.Items.Add(fi);

或使用.AddRange()添加项目列表

listBox1.Items.AddRange(fileQuery.ToList());

请参阅msdn链接以获取更多信息MSDN

listbox

1 个答案: