投自IEnumerable <object>到IEnumerable的<decimal>

Question

我有這樣的代碼：

IDictionary<string, IEnumerable<object>> setValues = new Dictionary<string, IEnumerable<object>>() 
{ 
    { "IN_PARTENER", dtResult.Rows.Cast<DataRow>().Select(row => row["IN_PARTENER"]) }, 
    { "IN_DATA", dtResult.Rows.Cast<DataRow>().Select(row => row["IN_DATA"]) }, 
    { "IN_VALOARE", dtResult.Rows.Cast<DataRow>().Select(row => row["IN_VALOARE"]) }, 
    { "OUT_PARTENER", dtResult.Rows.Cast<DataRow>().Select(row => row["OUT_PARTENER"]) }, 
    { "OUT_DATA", dtResult.Rows.Cast<DataRow>().Select(row => row["OUT_DATA"]) }, 
    { "OUT_VALOARE", dtResult.Rows.Cast<DataRow>().Select(row => row["OUT_VALOARE"]) }, 
    { "TOTAL_ZI", dtResult.Rows.Cast<DataRow>().Select(row => row["TOTAL_ZI"]) }, 
}; 

我想爲字符串IN_VALOARE和OUT_VALOARE從string到decimal轉換，但我不知道該怎麼辦呢

Answer 1

您可以在Select之內執行此操作：

.Select(row => (decimal)row["IN_VALOARE"]) 

全碼：

IDictionary<string, IEnumerable<object>> setValues = new Dictionary<string, IEnumerable<object>>() 
{ 
    { "IN_PARTENER", dtResult.Rows.Cast<DataRow>().Select(row => row["IN_PARTENER"]) }, 
    { "IN_DATA", dtResult.Rows.Cast<DataRow>().Select(row => row["IN_DATA"]) }, 
    { "IN_VALOARE", dtResult.Rows.Cast<DataRow>().Select(row => (decimal)row["IN_VALOARE"]) }, 
    { "OUT_PARTENER", dtResult.Rows.Cast<DataRow>().Select(row => row["OUT_PARTENER"]) }, 
    { "OUT_DATA", dtResult.Rows.Cast<DataRow>().Select(row => row["OUT_DATA"]) }, 
    { "OUT_VALOARE", dtResult.Rows.Cast<DataRow>().Select(row => (decimal)row["OUT_VALOARE"]) }, 
    { "TOTAL_ZI", dtResult.Rows.Cast<DataRow>().Select(row => row["TOTAL_ZI"]) }, 
}; 

既然你不能用不同的值類型的字典（沒有得到哈克），也許你應該看看使用自定義類，而不是：

public class MyThing 
{ 
    public string InPartener { get; set; } 
    public string InData { get; set; } 
    public decimal InValoare { get; set; } 
    public string OutPartener { get; set; } 
    public string OutData { get; set; } 
    public decimal OutValoare { get; set; } 
    public string TotalZi { get; set; } 
} 

，並將這些名單類：

var myThings = dtResult.Rows.Cast<DataRow>().Select(r => new MyThing 
{ 
    InPartener = r["IN_PARTENER"], 
    InData = r["IN_DATA"], 
    InValoare = (decimal)r["IN_VALOARE"], 
    OutPartener = r["OUT_PARTENER"], 
    OutData = r["OUT_DATA"], 
    OutValoare = (decimal)r["OUT_VALOARE"], 
    TotalZi = r["TOTAL_ZI"] 
};