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C# Dictionary 是否包含key

                Dictionary<string, string> dict = new Dictionary<string, string>();
                list.Add("BENEFICIARY", "受益所有人");
                var res12 = string.Empty;
                var dicKey = "1000";
                dict.TryGetValue(dicKey, out res12);

                res12 = string
.Empty; dicKey = "BENEFICIARY"; dict.TryGetValue(dicKey, out res12); res12 = string.Empty; dicKey = "1000"; if (dict.Keys.Contains(dicKey)) { res12 = dict[dicKey]; } res12
= string.Empty; dicKey = "BENEFICIARY"; if (dict.Keys.Contains(dicKey)) { res12 = dict[dicKey]; } res12 = string.Empty; dicKey = "1000"; if (dict.ContainsKey(dicKey)) { res12
= dict[dicKey]; } res12 = string.Empty; dicKey = "BENEFICIARY"; if (dict.ContainsKey(dicKey)) { res12 = dict[dicKey]; }