比较c#中string类型的Dictionary Key和另一个字符串

本文关键字：Key 另一个 字符串 Dictionary string 类型 比较 | 更新日期: 2023-09-27 17:49:35

我实际上是在检查string是否等于我的Dictionary对象中的任何键。

到目前为止我所做的是:

using (var oStreamReader = new StreamReader(path))
{
    Dictionary<String, String> typeNames = new Dictionary<string, string>();
    typeNames.Add("Kind","nvarchar(1000)");
    typeNames.Add("Name","nvarchar(1000)");
    DataTable oDataTable = new DataTable();
    var headLine = oStreamReader.ReadLine().Trim().Replace("'"", ""); 
    var columnNames = headLine.Split(new[] { ';' });
    String[] oStreamDataValues;
    /*
    *create DataTable header with specific datatypes and names
    */
    int countCol = 0;
    foreach (string readColumn in columnNames)
    {

        if ((readColumn.ToString().Replace("'"", "").CompareTo(typeNames) == true))
        {
            // this comparison doesn't work
        }
    }
}

比较c#中string类型的Dictionary Key和另一个字符串

我不太清楚你到底想达到什么目的。如果你有一个c#字典，你可以使用linq来检查与所需值匹配的值，例如

string valueToCompare = "Value to match";
Dictionary<string, string> dict = new Dictionary<string, string> 
                                  {
                                    {"Key 1", "A value"}, 
                                    {"Key 2", "Another value"}
                                  };
bool found= dict.Values
                .Any(value 
                     => 
                     value.Equals(valueToCompare,
                                  StringComparison.CurrentCultureIgnoreCase)
                    );

既然你想检查你的字典中是否存在一个条目，作为你的columnNames对象中一个值的相同键，我建议你使用ContainsKey方法

Dictionary<string, string> d = new Dictionary<string, string>();
            string keyvalue;
            if (d.ContainsKey("value to find"))
            {
                if (d.TryGetValue("value to find", out keyvalue))
                {
                    //// here keyvalue variable has the value 
                }
                else
                {
                    ///value is null or throws exception
                }
            }
            else
            {
                    ////key no exists
            }

我已经解决了这个问题(受到Paul Houlston和Thomas Lielacher的启发)

string headLine = oStreamReader.ReadLine().Trim().Replace("'"", ""); 
string columnNames = headLine.Split(new[] { ';' });
foreach (string readColumn in columnNames)
{
    if (typeNames.Keys.Contains(readColumn, StringComparer.CurrentCultureIgnoreCase) == true)
    {
       DataColumn oDataColumn = new DataColumn(readColumn,typeof(System.String));
       oDataTable.Columns.Add(oDataColumn);
    }
}
相关文章：