我正在嘗試編寫一些帶有offset值的代碼，然后生成第一個/下一個/上一個/最后一個鏈接。我目前有類似下面的內容，但一直在考慮邊緣情況，我的計算結果出現了偏差。我想有人一定已經在某個地方做過這個，但找不到可以查看/使用的庫。public class PagedItems<T>{ public PagedItems() { } public PagedItems(int offset, int totalSize, IEnumerable<T> subset) { this.Offset = offset; this.TotalSize = totalSize; this.Data = subset; this.Links = new Dictionary<string, Uri>(); var pageCount = (totalSize - offset) / 20; if (offset > 20) { this.Links.Add("prev", new Uri($"/accounts?skip={offset - 20}")); } if (offset < (totalSize - offset)) { this.Links.Add("last", new Uri($"/accounts/skip={totalSize - 20}")); } } public int Offset { get; } public int Size => this.Data.Count(); public int TotalSize { get; } public IEnumerable<T> Data { get; } public Dictionary<string, Uri> Links { get; }}
1 回答
明月笑刀無情
TA貢獻1828條經驗 獲得超4個贊
對于任何想要這個的人，我可以使用此代碼和圍繞邏輯進行單元測試：
public class PagedItems<T>
{
private readonly int pageSize;
public PagedItems()
{
}
public PagedItems(int offset, int pageSize, int totalSize, IEnumerable<T> subset, Uri baseUri)
{
this.Offset = offset;
this.pageSize = pageSize;
this.TotalSize = totalSize;
this.Data = subset;
this.Links = new Dictionary<string, string>();
if (ShouldDisplayPrevAndFirstLink(offset))
{
var linkValue = Math.Max(offset - pageSize, 0);
var link = QueryHelpers.AddQueryString(baseUri.OriginalString, "skip", linkValue.ToString());
this.Links.Add("prev", link);
}
if (ShouldDisplayNextAndLastLink(offset, totalSize, pageSize))
{
var linkValue = offset + pageSize;
var link = QueryHelpers.AddQueryString(baseUri.OriginalString, "skip", linkValue.ToString());
this.Links.Add("next", link);
}
if (ShouldDisplayPrevAndFirstLink(offset))
{
var link = QueryHelpers.AddQueryString(baseUri.OriginalString, "skip", "0");
this.Links.Add("first", link);
}
if (ShouldDisplayNextAndLastLink(offset, totalSize, pageSize))
{
var linkValue = totalSize - pageSize;
var link = QueryHelpers.AddQueryString(baseUri.OriginalString, "skip", linkValue.ToString());
this.Links.Add("last", link);
}
}
private static bool ShouldDisplayNextAndLastLink(int offset, int totalSize, int pageSize) => offset < totalSize - pageSize;
private static bool ShouldDisplayPrevAndFirstLink(int offset) => offset > 0;
public int Offset { get; }
public int Size => this.Data.Count();
public int TotalSize { get; }
public IEnumerable<T> Data { get; }
public Dictionary<string, string> Links { get; }
}
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